Publications (198)
Accumulation and control of spin waves in magnonic dielectric microresonators by a comb of ultrashort laser pulses
A. E. Khramova, M. Kobecki, I. A. Akimov +7
Spin waves in magnetic microresonators are at the core of modern magnonics. Here we demonstrate a new method of tunable excitation of different spin wave modes in magnetic microdis…
Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effect
F. Heisterkamp, E. A. Zhukov, A. Greilich +4
The spin dynamics of the strongly localized, donor-bound electrons in fluorine-doped ZnSe epilayers is studied by pump-probe Kerr rotation techniques. A method exploiting the spin…
Hole spin coherence in InAs/InAlGaAs self-assembled quantum dots emitting at telecom wavelengths
E. Evers, N. E. Kopteva, V. Nedelea +6
We report measurements of the longitudinal and transverse spin relaxation times of holes in an ensemble of self-assembled InAs/InAlGaAs quantum dots (QDs), emitting in the telecom…
Picosecond opto-acoustic interferometry and polarimetry in high-index GaAs
A. V. Scherbakov, M. Bombeck, J. V. Jäger +6
By means of a metal opto-acoustic transducer we generate quasi-longitudinal and quasi-transverse picosecond strain pulses in a (311)-GaAs substrate and monitor their propagation by…
Engineering of spin-lattice relaxation dynamics by digital growth of diluted magnetic semiconductor CdMnTe
M. K. Kneip, D. R. Yakovlev, M. Bayer +3
The technological concept of "digital alloying" offered by molecular-beam epitaxy is demonstrated to be a very effective tool for tailoring static and dynamic magnetic properties o…
Nuclear spin dynamics influenced and detected by electron spin polarization in CdTe/CdMgTe quantum wells
E. Evers, T. Kazimierczuk, F. Mertens +6
Nuclear spin coherence and relaxation dynamics of all constituent isotopes of an n-doped CdTe/(Cd,Mg)Te quantum well structure are studied employing optically detected nuclear magn…
Photon echo from localized excitons in semiconductor nanostructures
S. V. Poltavtsev, I. A. Yugova, I. A. Akimov D. R. Yakovlev +1
An overview on photon echo spectroscopy under resonant excitation of the exciton complexes in semiconductor nanostructures is presented. The use of four-wave-mixing technique with…
Intrinsic spin fluctuations reveal the dynamical response function of holes coupled to nuclear spin baths in (In,Ga)As quantum dots
Yan Li, N. Sinitsyn, D. L. Smith +5
The problem of how single "central" spins interact with a nuclear spin bath is essential for understanding decoherence and relaxation in many quantum systems, yet is highly nontriv…
Selective spin wave excitation in ferromagnetic (Ga,Mn)As layers by picosecond strain pulses
M. Bombeck, A. S. Salasyuk, B. A. Glavin +8
We demonstrate selective excitation of a spin wave mode in a ferromagnetic (Ga,Mn)As film by picosecond strain pulses. For a certain range of magnetic fields applied in the layer p…
Photon echoes from (In,Ga)As quantum dots embedded in a Tamm-plasmon microcavity
M. Salewski, S. V. Poltavtsev, Yu. V. Kapitonov +9
We report on the coherent optical response from an ensemble of (In,Ga)As quantum dots (QDs) embedded in a planar Tamm-plasmon microcavity with a quality factor of approx. 100. Sign…
Optical properties of two-dimensional gallium chalcogenide films
O. Del Pozo-Zamudio, S. Schwarz, M. Sich +12
Gallium chalcogenides are promising building blocks for novel van der Waals heterostructures. We report low-temperature micro-photoluminescence (PL) of GaTe and GaSe films with thi…
The Knight field and the local nuclear dipole-dipole field in an (In,Ga)As quantum dot ensemble
T. Auer, R. Oulton, A. Bauschulte +6
We present a comprehensive investigation of the electron-nuclear system of negatively charged InGaAs/GaAs self-assembled quantum dots under the influence of weak external magnetic…
Observation of high angular momentum excitons in cuprous oxide
J. Thewes, J. Heckötter, T. Kazimierczuk +5
The recent observation of dipole-allowed -excitons up to principal quantum numbers of in cuprous oxide has given insight into exciton states with unprecedented spectral r…
Temperature dependence of hole spin coherence in (In,Ga)As quantum dots measured by mode-locking and echo techniques
S. Varwig, A. René, A. Greilich +4
The temperature dependence of the coherence time of hole spins confined in self-assembled (In,Ga)As/GaAs quantum dots is studied by spin mode-locking and spin echo techniques. Cohe…
Spin-lattice relaxation of Mn-ions in ZnMnSe/ZnBeSe quantum wells measured under pulsed photoexcitation
M. K. Kneip, D. R. Yakovlev, M. Bayer +6
The dynamics of spin-lattice relaxation of the Mn-ions in (Zn,Mn)Se-based diluted-magnetic-semiconductor quantum wells is studied by time-resolved photoluminescence. The spin-latti…
Mode locking of hole spin coherences in CsPb(Cl,Br) perovskite nanocrystals
E. Kirstein, N. E. Kopteva, D. R. Yakovlev +8
The spin physics of perovskite nanocrystals with confined electrons or holes is attracting increasing attention, both for fundamental studies and spintronic applications. Here, sta…
Polarimetry of photon echo on charged and neutral excitons in CdTe/(Cd,Mg)Te quantum wells
S. V. Poltavtsevy, Yu. V. Kapitonovy, I. A. Yugova +6
Coherent optical spectroscopy such as four-wave mixing and photon echo generation deliver detailed information on the energy levels involved in optical transitions through the anal…
Coherent dynamics of localized excitons and trions in ZnO/(Zn,Mg)O quantum wells studied by photon echoes
I. A. Solovev, S. V. Poltavtsev, Yu. V. Kapitonov +5
We study optically the coherent evolution of trions and excitons in a -doped 3.5 nm-thick ZnO/ZnMgO multiple quantum well by means of time-resolved four-wave…
Quantum Interference Controls the Electron Spin Dynamics in n-GaAs
V. V. Belykh, A. Yu. Kuntsevich, M. M. Glazov +3
Manifestations of quantum interference effects in macroscopic objects are rare. Weak localization is one of the few examples of such effects showing up in the electron transport th…
Spin diffusion in the Mn2+ ion system of II-VI diluted magnetic semiconductor heterostructures
A. A. Maksimov, D. R. Yakovlev, J. Debus +6
The magnetization dynamics in diluted magnetic semiconductor heterostructures based on (Zn,Mn)Se and (Cd,Mn)Te has been studied experimentally by optical methods and simulated nume…
Magnetic field induced exciton spin dynamics in indirect band gap (In,Al)As/AlAs quantum dots
T. S. Shamirzaev, D. R. Yakovlev, D. S. Smirnov +5
The exciton recombination and spin dynamics are investigated both experimentally and theoretically in an ensemble of indirect band gap (In,Al)As/AlAs quantum dots (QDs) with type-I…
Enhancement of electron hot spot relaxation in photoexcited plasmonic structures by thermal diffusion
F. Spitzer, B. A. Glavin, V. I. Belotelov +6
We demonstrate that in confined plasmonic metal structures subject to ultra-fast laser excitation electron thermal diffusion can provide relaxation faster than the energy transfer…
The effect of dynamical compressive and shear strain on magnetic anisotropy in low symmetry ferromagnetic film
T. L. Linnik, V. N. Kats, J. Jäger +7
Dynamical strain generated upon excitation of a metallic film by a femtosecond laser pulse may become a versatile tool enabling control of magnetic state of thin films and nanostru…
Hanle effect in (In,Ga)As quantum dots: Role of nuclear spin fluctuations
M. S. Kuznetsova, K. Flisinski, I. Ya. Gerlovin +7
The role of nuclear spin fluctuations in the dynamic polarization of nuclear spins by electrons is investigated in (In,Ga)As quantum dots. The photoluminescence polarization under…
Temperature induced spin coherence dissipation in quantum dots
F. G. G. Hernandez, A. Greilich, F. Brito +5
The temperature dependence of electron spin coherence in singly negatively charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday rotation. The decoherence time T2…
Electric field control of magnetization dynamics in ZnMnSe/ZnBeSe diluted-magnetic-semiconductor heterostructures
M. K. Kneip, D. R. Yakovlev, M. Bayer +3
We show that the magnetization dynamics in diluted magnetic semiconductors can be controlled separately from the static magnetization by means of an electric field. The spin-lattic…
Optical control of coherent interactions between quantum dot electron spins
S. Spatzek, A. Greilich, Sophia E. Economou +7
Coherent interactions between spins in quantum dots are a key requirement for quantum gates. We have performed pump-probe experiments in which pulsed lasers emitting at different p…
Spin Inertia of Resident and Photoexcited Carriers in Singly-Charged Quantum Dots
E. A. Zhukov, E. Kirstein, D. S. Smirnov +6
The spin dynamics in a broad range of systems can be studied using circularly polarized optical excitation with alternating helicity. The dependence of spin polarization on the fre…
Excitation of magnon accumulation by laser clocking as a source of long-range spin waves in transparent magnetic films
M. Jäckl, V. I. Belotelov, I. A. Akimov +4
Optical tools are of great promise for generation of spin waves due to the possibility to manipulate on ultrashort time scales and to provide local excitation. However, a single la…
Tailored quantum dots for entangled photon pair creation
A. Greilich, M. Schwab, T. Berstermann +7
We compare the asymmetry-induced exchange splitting delta_1 of the bright-exciton ground-state doublet in self-assembled (In,Ga)As/GaAs quantum dots, determined by Faraday rotation…
Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe
F. Heisterkamp, E. Kirstein, A. Greilich +5
We study the dynamics of optically-induced nuclear spin polarization in a fluorine-doped ZnSe epilayer via time-resolved Kerr rotation. The nuclear polarization in the vicinity of…
Robust manipulation of electron spin coherence in an ensemble of singly charged quantum dots
A. Greilich, M. Wiemann, F. G. G. Hernandez +7
Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin co…
Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures
D. S. Smirnov, T. S. Shamirzaev, D. R. Yakovlev +1
We suggest a new spin orientation mechanism for localized electrons: . The angular momentum for the electr…
Coherent magnetization precession in ferromagnetic (Ga,Mn)As induced by picosecond acoustic pulses
A. V. Scherbakov, A. S. Salasyuk, A. V. Akimov +7
We show that the magnetization of a thin ferromagnetic (Ga,Mn)As layer can be modulated by picosecond acoustic pulses. In this approach a picosecond strain pulse injected into the…
Increased sensitivity of spin noise spectroscopy using homodyne detection in -doped GaAs
M. Yu. Petrov, A. N. Kamenskii, V. S. Zapasskii +2
We implement the homodyne detection scheme for an increase of the polarimetric sensitivity in spin noise spectroscopy. Controlling the laser intensity of the local oscillator, whic…
Spin dynamics of electrons and holes in InGaAs/GaAs quantum wells at milliKelvin temperatures
L. V. Fokina, I. A. Yugova, D. R. Yakovlev +6
The carrier spin dynamics in a n-doped (In,Ga)As/GaAs quantum well has been studied by time-resolved Faraday rotation and ellipticity techniques in the temperature range down to 43…
Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells
E. A. Zhukov, D. R. Yakovlev, M. Bayer +5
The mechanisms for generation of long-lived spin coherence in a two-dimensional electron gas (2DEG) have been studied experimentally by means of a picosecond pump-probe Kerr rotati…
Hyperfine interaction mediated exciton spin relaxation in (In,Ga)As quantum dots
H. Kurtze, D. R. Yakovlev, D. Reuter +2
The population dynamics of dark and bright excitons in (In,Ga)As/GaAs quantum dots is studied by two-color pump-probe spectroscopy in an external magnetic field. With the field app…
Optical cooling of nuclear spins in GaAs/(Al,Ga)As quantum wells at subkelvin temperatures: Evidence of the dynamic self-polarization of nuclear spins
M. Kotur, D. Kudlacik, N. E. Kopteva +4
We investigate the dynamic polarization of nuclear spins in a nominally undoped GaAs/AlGaAs quantum well using two complementary experimental approaches: time-res…
Optical orientation of excitons in a longitudinal magnetic field in indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment
T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov +5
The exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment are studied. The negligible (less than eV)…
Antiferromagnetic nonreciprocity of light emission in CuBO
A. R. Nurmukhametov, D. R. Yakovlev, V. Yu. Ivanov +4
Nonreciprocity of light emission, when the radiation intensity differs for two opposite propagation directions, is a rare phenomenon in solids because it requires a violation of th…
The in-plane anisotropy of the hole factor in CdTe/(Cd,Mg)Te quantum wells studied by spin-dependent photon echoes
S. V. Poltavtsev, I. A. Yugova, A. N. Kosarev +6
We use the two-pulse spin-dependent photon echo technique to study the in-plane hole spin anisotropy in a 20~nm-thick CdTe/CdMgTe single quantum well by exciting…
Electron charge and spin delocalization revealed in the optically probed longitudinal and transverse spin dynamics in -GaAs
V. V. Belykh, K. V. Kavokin, D. R. Yakovlev +1
The evolution of the electron spin dynamics as consequence of carrier delocalization in -type GaAs is investigated by the recently developed extended pump-probe Kerr/Faraday rot…
Exciton and trion dynamics in atomically thin MoSe2 and WSe2: effect of localization
D. Schmidt, T. Godde, J. Schmutzler +9
We present a detailed investigation of the exciton and trion dynamics in naturally doped MoSe2 and WSe2 single atomic layers as a function of temperature in the range 10-300K under…
Spin noise of electrons and holes in (In,Ga)As quantum dots: experiment and theory
P. Glasenapp, D. S. Smirnov, A. Greilich +4
The spin fluctuations of electron and hole doped self-assembled quantum dot ensembles are measured optically in the low-intensity limit of a probe laser in absence and presence of…
Resonant driving of magnetization precession in a ferromagnetic layer by coherent monochromatic phonons
J. V. Jäger, A. V. Scherbakov, B. A. Glavin +6
We realize resonant driving of the magnetization precession by monochromatic phonons in a thin ferromagnetic layer embedded into a phononic Fabry-Perot resonator. A femtosecond las…
Theory of spin inertia in singly-charged quantum dots
D. S. Smirnov, E. A. Zhukov, E. Kirstein +6
The spin inertia measurement is a recently emerged tool to study slow spin dynamics, which is based on the excitation of the system by a train of circularly polarized pulses with a…
Second harmonic generation spectroscopy of excitons in ZnO
M. Lafrentz, D. Brunne, A. V. Rodina +5
Nonlinear optics of semiconductors is an important field of fundamental and applied research, but surprisingly the role of excitons in the coherent processes leading to harmonics g…
Spin-induced optical second harmonic generation in the centrosymmetric magnetic semiconductors EuTe and EuSe
B. Kaminski, M. Lafrentz, R. V. Pisarev +9
Spectroscopy of the centrosymmetric magnetic semiconductors EuTe and EuSe reveals spin-induced optical second harmonic generation (SHG) in the band gap vicinity at 2.1-2.4eV. The m…
Multiple transfer of angular momentum quanta from a spin-polarized hole to magnetic ions in ZnMnSe/ZnBeSe quantum wells
A. V. Akimov, A. V. Scherbakov, D. R. Yakovlev +4
The magnetization kinetics in (Zn,Mn)Se/(Zn,Be)Se quantum wells has been studied on a ps-time scale after pulsed laser excitation. The magnetization induced by an external magnetic…
Controlled lasing from active optomechanical resonators
T. Czerniuk, C. Brueggemann, J. Tepper +8
Planar microcavities with distributed Bragg reflectors (DBRs) host, besides confined optical modes, also mechanical resonances due to stop bands in the phonon dispersion relation o…
Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots
E. Evers, N. E. Kopteva, I. A. Yugova +3
The dynamics of the coupled electron-nuclear spin system is studied in an ensemble of singly-charged (In,Ga)As/GaAs quantum dots (QDs) using periodic optical excitation at 1 GHz re…
Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe
F. Heisterkamp, A. Greilich, E. A. Zhukov +7
Optically-induced nuclear spin polarization in a fluorine-doped ZnSe epilayer is studied by time-resolved Kerr rotation using resonant excitation of donor-bound excitons. Excitatio…
Plasmon to exciton spin conversion in semiconductor-metal hybrid structures
I. A. Akimov, A. N. Poddubny, J. Vondran +7
Optical control of electronic spins is the basis for ultrafast spintronics: circularly polarized light in combination with spin-orbit coupling of the electronic states allows for s…
Coherent spin dynamics of electrons and holes in semiconductor quantum wells and quantum dots under periodical optical excitation: resonant spin amplification versus spin mode-locking
I. A. Yugova, M. M. Glazov, D. R. Yakovlev +2
The coherent spin dynamics of resident carriers, electrons and holes, in semiconductor quantum structures is studied by periodical optical excitation using short laser pulses and i…
Photon echoes retrieved from semiconductor spins: access to basis for long-term optical memories
L. Langer, S. V. Poltavtsev, I. A. Yugova +6
The possibility to store optical information is important for classical and quantum communication. Atoms or ions as well as color centers in crystals offer suitable two-level syste…
Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells
S. V. Poltavtsev, I. A. Solovev, I. A. Akimov +6
We study the coherent dynamics of localized excitons in 100-periods of 2.5 nm thick (In,Ga)N/GaN quantum wells with 7.5% indium concentration, measured with spectroscopic resolutio…
Bragg-enhanced time-domain Brillouin scattering from a propagating acoustic grating
O. S. Ken, D. O. Horiachyi, V. L. Korenev +4
Generation and detection of coherent phonons in semiconductors by femtosecond optical pulses is a powerful tool for high-frequency acoustic control of their electronic properties.…
Spin-flip Raman scattering of the -X mixed exciton in indirect band-gap (In,Al)As/AlAs quantum dots
J. Debus, T. S. Shamirzaev, D. Dunker +5
The band structure of type-I (In,Al)As/AlAs quantum dots with band gap energy exceeding 1.63 eV is indirect in momentum space, leading to long-lived exciton states with potential a…
Radiofrequency driving of coherent electron spin dynamics in -GaAs detected by Faraday rotation
V. V. Belykh, D. R. Yakovlev, M. Bayer
We suggest a new pump-probe method for studying semiconductor spin dynamics based on pumping of carrier spins by a pulse of oscillating radiofrequency (rf) magnetic field and probi…
Anomalous magnetic suppression of spin relaxation in a two-dimensional electron gas in a GaAs/AlGaAs quantum well
V. V. Belykh, M. V. Kochiev, D. N. Sob'yanin +2
We study the spin dynamics in a high-mobility two-dimensional electron gas confined in a GaAs/AlGaAs quantum well. An unusual magnetic field dependence of the spin relaxation is fo…
Anisotropies in the linear polarization of vacancy photoluminescence in diamond induced by crystal rotations and strong magnetic fields
D. Braukmann, V. P. Popov, E. R. Glaser +3
We study the linear polarization properties of the photoluminescence of the neutral and negatively charged nitrogen vacancies and neutral vacancies in diamond crystals as function…
Invariants in the paramagnetic resonance spectra of impurity crystals
A. N. Kamenskii, V. O. Kozlov, N. S. Kuznetsov +5
We show that in cubic crystals with anisotropic impurity centers the sum of squares of the magnetic resonance (EPR) frequencies is invariant with respect to the magnetic field dire…
Ultrafast optical rotations of electron spins in quantum dots
A. Greilich, Sophia E. Economou, S. Spatzek +5
Coherent manipulation of quantum bits (qubits) on time scales much shorter than the coherence time is a key prerequisite for quantum information processing. Electron spins in quant…
Scaling laws of Rydberg excitons
J. Heckötter, M. Freitag, D. Fröhlich +4
Rydberg atoms have attracted considerable interest due to their huge interaction among each other and with external fields. They demonstrate characteristic scaling laws in dependen…
Magneto-optics of excitons interacting with magnetic ions in CdSe/CdMnS colloidal nanoplatelets
E. V. Shornikova, D. R. Yakovlev, D. O. Tolmachev +10
Excitons in diluted magnetic semiconductors represent excellent probes for studying the magnetic properties of these materials. Various magneto-optical effects, which depend sensit…
Förster energy transfer of dark excitons enhanced by a magnetic field in an ensemble of CdTe colloidal nanocrystals
Feng Liu, A. V. Rodina, D. R. Yakovlev +7
We present a systematic experimental study along with theoretical modeling of the energy transfer in an ensemble of closely-packed CdTe colloidal nanocrystals identified as the Fö…
Electron and hole g factors in InAs/InAlGaAs self-assembled quantum dots emitting at telecom wavelengths
V. V. Belykh, A. Greilich, D. R. Yakovlev +4
We extend the range of quantum dot (QD) emission energies where electron and hole factors have been measured to the practically important telecom range. The spin dynamics in In…
Optical orientation of hole magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells
E. A. Zhukov, Yu. G. Kusrayev, K. V. Kavokin +8
The optically induced spin polarization in (Cd,Mn)Te/(Cd,Mn,Mg)Te diluted-magnetic-semiconductor quantum wells is investigated by means of picosecond pump-probe Kerr rotation. At 1…
Generation and detection of mode-locked spin coherence in (In,Ga)As/GaAs quantum dots by laser pulses of long duration
S. Spatzek, S. Varwig, M. M. Glazov +5
Using optical pulses of variable duration up to 80 ps, we report on spin coherence initialization and its subsequent detection in n-type singly-charged quantum dots, subject to a t…
Single beam detection of optically driven spin dynamics in CdTe/(Cd,Mg)Te quantum wells
F. Saeed, M. Kuhnert, I. A. Akimov +8
We study optical pumping of resident electron spins under resonant excitation of trions in n-type CdTe/(Cd,Mg)Te quantum wells subject to a transverse magnetic field. In contrast t…
Tuning the nuclei-induced spin relaxation of localized electrons by the quantum Zeno and anti-Zeno effects
V. Nedelea, N. V. Leppenen, E. Evers +3
Quantum measurement back action is fundamentally unavoidable when manipulating electron spins. Here we demonstrate that this back action can be efficiently exploited to tune the sp…
Evidencing the squeezed dark nuclear spin state in lead halide perovskites
E. Kirstein, D. S. Smirnov, E. A. Zhukov +6
Coherent many-body states are highly promising for robust and scalable quantum information processing. While far-reaching theoretical predictions have been made for various impleme…
Nonreciprocal magnetic-field-induced second harmonic generation of exciton polaritons in ZnSe
J. Mund, D. R. Yakovlev, A. Farenbruch +5
We report on the optical second harmonic generation (SHG) on the 1S exciton-polariton resonance in bulk ZnSe that is subject to an external magnetic field applied perpendicular to…
Dynamic polarization of electron spins in indirect band gap (In,Al)As/AlAs quantum dots in weak magnetic field: experiment and theory
T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov +3
A novel spin orientation mechanism - dynamic electron spin polarization has been recently suggested in Phys. Rev. Lett. , 156801 (2020). It takes place for unpolarize…
Damping of Rabi oscillations in intensity-dependent photon echoes from exciton complexes in a CdTe/(Cd,Mg)Te single quantum well
S. V. Poltavtsev, M. Reichelt, I. A. Akimov +6
We study Rabi oscillations detected in the coherent optical response from various exciton complexes in a 20~nm-thick CdTe/(Cd,Mg)Te quantum well using time-resolved photon echoes.…
Exciton spin dynamics and photoluminescence polarization of CdSe/CdS dot-in-rod nanocrystals in high magnetic fields
B. Siebers, L. Biadala, D. R. Yakovlev +4
The exciton spin dynamics and polarization properties of the related emission are investigated in colloidal CdSe/CdS dot-in-rod (DiR) and spherical core/shell nanocrystal (NC) ense…
Millisecond spin lifetimes in quantum dots at zero applied magnetic field due to strong electron-nuclear interaction
A. Greilich, R. Oulton, S. Yu. Verbin +7
A key to achieving ultra-long electron spin memory in quantum dots (QDs) at 0~ is the polarization of the nuclei, such that the electron spin is stabilized along the nuclear mag…
High resolution study of the yellow excitons in CuO subject to an electric field
J. Heckötter, M. Freitag, D. Fröhlich +4
We have used high resolution transmission spectroscopy to study the exciton level spectrum in CuO subject to a longitudinal external electric field, i.e., in the geometry where…
Long-range p-d exchange interaction in a ferromagnet-semiconductor Co/CdMgTe/CdTe quantum well hybrid structure
I. A. Akimov, M. Salewski, I. V. Kalitukha +14
The exchange interaction between magnetic ions and charge carriers in semiconductors is considered as prime tool for spin control. Here, we solve a long-standing problem by uniquel…
Nonequilibrium spin noise in a quantum dot ensemble
D. S. Smirnov, Ph. Glasenapp, M. Bergen +5
The spin noise in singly charged self-assembled quantum dots is studied theoretically and experimentally under the influence of a perturbation, provided by additional photoexcited…
Giant effective Zeeman splitting in a monolayer semiconductor realized by spin-selective strong light-matter coupling
T. P. Lyons, D. J. Gillard, C. Leblanc +11
Strong coupling between light and the fundamental excitations of a two-dimensional electron gas (2DEG) are of foundational importance both to pure physics and to the understanding…
Photon echo polarimetry of excitons and biexcitons in a CHNHPbI perovskite single crystal
A. V. Trifonov, S. Grisard, A. N. Kosarev +5
Lead halide perovskites show remarkable performance when used in photovoltaic and optoelectronic devices. However, the peculiarities of light-matter interactions in these materials…
Effect of electric current on optical orientation of electrons in AlGaAs/GaAs heterostructure
O. S. Ken, E. A. Zhukov, I. A. Akimov +10
The effect of a lateral electric current on the photoluminescence H-band of an AlGaAs/GaAs heterostructure is investigated. The photoluminescence intensity and optical orientation…
High resolution two-dimensional optical spectroscopy of electron spins
M. Salewski, S. V. Poltavtsev, I. A. Yugova +7
Multidimensional coherent optical spectroscopy is one of the most powerful tools for investigating complex quantum mechanical systems. While it was conceived decades ago in magneti…
Exciton-Trion Coherent Interactions in a CdTe/CdMgTe Quantum Well
G. Moody, I. A. Akimov, H. Li +7
We present a collection of zero-, one- and two-quantum two-dimensional coherent spectra of excitons and trions in a CdTe/(Cd,Mg)Te quantum well. The set of spectra provides a uniqu…
All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime
E. A. Zhukov, A. Greilich, D. R. Yakovlev +11
Resonant cooling of different nuclear isotopes manifested in optically-induced nuclear magnetic resonances (NMR) is observed in n-doped CdTe/(Cd,Mg)Te and ZnSe/(Zn,Mg)Se quantum we…
Wide band enhancement of the transverse magneto-optical Kerr effect in magnetite-based plasmonic crystals
S. A. Dyakov, L. Klompmaker, F. Spitzer +10
The transverse magneto-optical Kerr effect (TMOKE) in magnetite-based magneto-plasmonic crystals is studied experimentally and theoretically. We analyze angle-resolved TMOKE spectr…
Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
E. Evers, N. E. Kopteva, I. A. Yugova +5
The coherent electron spin dynamics of an ensemble of singly charged (In,Ga)As/GaAs quantum dots in a transverse magnetic field is driven by periodic optical excitation at 1 GHz re…
Exciton spin dynamics of colloidal CdTe nanocrystals in magnetic field
Feng Liu, A. V. Rodina, D. R. Yakovlev +6
The recombination and spin dynamics of excitons in colloidal CdTe nanocrystals (NCs) are studied by time-resolved photoluminescence in high magnetic fields up to 15 T and at cryoge…
Optical excitation of single- and multi-mode magnetization precession in Galfenol nanolayers
A. V. Scherbakov, A. P. Danilov, F. Godejohann +9
We demonstrate a variety of precessional responses of the magnetization to ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a ferromagnetic material with la…
Electron spin dynamics of Ce ions in YAG crystals studied by pulse-EPR and pump-probe Faraday rotation
D. V. Azamat, V. V. Belykh, D. R. Yakovlev +6
The spin relaxation dynamics of Ce ions in heavily cerium-doped YAG crystals is studied using pulse-electron paramagnetic resonance and time-resolved pump-probe Faraday rota…
Theory of magnetization precession induced by a picosecond strain pulse in ferromagnetic semiconductor (Ga,Mn)As
T. L. Linnik, A. V. Scherbakov, D. R. Yakovlev +3
A theoretical model of the coherent precession of magnetization excited by a picosecond acoustic pulse in a ferromagnetic semiconductor layer of (Ga,Mn)As is developed. The short s…
Plasmonic crystals for ultrafast nanophotonics: Optical switching of surface plasmon polaritons
M. Pohl, V. I. Belotelov, I. A. Akimov +6
We demonstrate that the dispersion of surface plasmon polaritons in a periodically perforated gold film can be efficiently manipulated by femtosecond laser pulses with the waveleng…
Strong enhancement of heavy-hole Landé factor in InGaAs symmetric quantum dots revealed by coherent optical spectroscopy
A. V. Trifonov, I. A. Akimov, L. E. Golub +9
We reveal the existence of a large in-plane heavy-hole factor in symmetric self-assembled (001) (In,Ga)As/GaAs quantum dots due to warping of valence band states. This warping…
Zeeman and Davydov splitting of Frenkel excitons in the antiferromagnet CuBO
N. E. Kopteva, D. Kudlacik, D. R. Yakovlev +4
The optical spectra of antiferromagnetic copper metaborate CuBO are characterized by an exceptionally rich structure of narrow absorption lines due to electronic transition…
Sub-nanosecond delay of light in (Cd,Zn)Te crystal
T. Godde, I. A. Akimov, D. R. Yakovlev +2
We study excitonic polariton relaxation and propagation in bulk CdZnTe using time- resolved photoluminescence and time-of-flight techniques. Propagation of picosecond optical pulse…
Detection and amplification of spin noise using scattered laser light in a quantum-dot microcavity
A. N. Kamenskii, M. Yu. Petrov, G. G. Kozlov +7
Fundamental properties of the spin-noise signal formation in a quantum-dot microcavity are studied by measuring the angular characteristics of the scattered light intensity. A dist…
Observation of three-particle complexes in WS monolayers
J. Jadczak, J. Kutrowska-Girzycka, P. Kapuscinski +6
Atomically thin semiconducting transition-metal dichalcogenides provide novel insights into the physics of many-body effects mediated by Coulomb interactions. Here, we report on te…
Electron cyclotron mass in undoped CdTe/CdMnTe quantum wells
A. A. Dremin, D. R. Yakovlev, A. A. Sirenko +4
Optically detected cyclotron resonance of two-dimensional electrons has been studied in nominally undoped CdTe/(Cd,Mn)Te quantum wells. The enhancement of carrier quantum confineme…