Publications (48)
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…
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…
Collective single mode precession of electron spins in a quantum dot ensemble
A. Greilich, S. Spatzek, I. A. Yugova +6
We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. Th…
Decay and revival of electron spin polarization in an ensemble of (In,Ga)As quantum dots
E. Evers, V. V. Belykh, N. E. Kopteva +6
The periodic optical orientation of electron spins in (In,Ga)As/GaAs quantum dots leads to the formation of electron spin precession modes about an external magnetic field which ar…
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…
Stimulated spin noise in an activated crystal
M. M. Sharipova, A. N. Kamenskii, I. I. Ryzhov +5
In the spin noise spectroscopy, the magnetic susceptibility spectrum is known to be provided by the spin-system untouched by any external perturbation, or, better to say, disturbed…
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…
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…
Nonlinear Faraday effect and spin noise in rare-earth activated crystals
A. N. Kamenskii, G. G. Kozlov, E. I. Baibekov +4
The spin-noise spectroscopy (SNS) method implies high efficiency of conversion of the spin-system magnetization to the Faraday rotation angle. Generally, this efficiency cannot be…
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…
Hole Spin Mixing in InAs Quantum Dot Molecules
M. F. Doty, J. I. Climente, A. Greilich +2
Holes confined in single InAs quantum dots have recently emerged as a promising system for the storage or manipulation of quantum information. These holes are often assumed to have…
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…
Extended pump-probe Faraday rotation spectroscopy of the submicrosecond electron spin dynamics in n-type GaAs
V. V. Belykh, E. Evers, D. R. Yakovlev +3
We develop an extended pump-probe Faraday rotation technique to study the submicrosecond electron spin dynamics with picosecond time resolution in a wide range of magnetic fields.…
Resonant spin amplification in Faraday geometry
P. Schering, E. Evers, V. Nedelea +6
We demonstrate the realization of the resonant spin amplification (RSA) effect in Faraday geometry where a magnetic field is applied parallel to the optically induced spin polariza…
Spin noise spectroscopy beyond thermal equilibrium and linear response
P. Glasenapp, Luyi Yang, D. Roy +5
Per the fluctuation-dissipation theorem, the information obtained from spin fluctuation studies in thermal equilibrium is necessarily constrained by the system's linear response fu…
Spin noise of electrons and holes in self-assembled quantum dots
S. A. Crooker, J. Brandt, C. Sandfort +5
We measure the frequency spectra of random spin fluctuations, or "spin noise", in ensembles of (In,Ga)As/GaAs quantum dots (QDs) at low temperatures. We employ a spin noise spectro…
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…
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…
Spin polarization recovery and Hanle effect for charge carriers interacting with nuclear spins in semiconductors
D. S. Smirnov, E. A. Zhukov, D. R. Yakovlev +3
We report on theoretical and experimental study of the spin polarization recovery and Hanle effect for the charge carriers interacting with the fluctuating nuclear spins in the sem…
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…
Gigantic spin-noise gain enables magnetic resonance spectroscopy of impurity crystals
A. N. Kamenskii, A. Greilich, I. I. Ryzhov +3
Spin noise spectroscopy is a method of magnetic resonance widely used, nowadays, in atomic and semiconductor research. Classical objects of the EPR spectroscopy - dielectrics with…
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…
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…
Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
I. A. Yugova, A. Greilich, D. R. Yakovlev +6
The Zeeman splitting and the underlying value of the g-factor for conduction band electrons in GaAs/Al_xGa_{1-x}As quantum wells have been measured by spin-beat spectroscopy based…
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…
All-optical implementation of a dynamic-decoupling protocol for hole spins in (In,Ga)As quantum dots
S. Varwig, E. Evers, A. Greilich +4
We demonstrate the potential of a periodic laser-pulse protocol for dynamic decoupling of hole spins in (In,Ga)As quantum dots from surrounding baths. When doubling the repetition…
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…
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…
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…
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…
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…
Spin coherence of holes in GaAs/AlGaAs quantum wells
M. Syperek, D. R. Yakovlev, A. Greilich +4
The carrier spin coherence in a p-doped GaAs/(Al,Ga)As quantum well with a diluted hole gas has been studied by picosecond pump-probe Kerr rotation with an in-plane magnetic field.…
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…
Two-color spin noise spectroscopy: Using spin fluctuation correlations to reveal homogeneous linewidths within quantum dot ensembles
Luyi Yang, P. Glasenapp, A. Greilich +3
"Spin noise spectroscopy" (SNS) is a powerful optical technique for probing electron and hole spin dynamics that is based on detecting their intrinsic and random fluctuations while…
Resources of polarimetric sensitivity in spin noise spectroscopy
P. Glasenapp, A. Greilich, I. I. Ryzhov +4
We attract attention to the fact that the ultimate (shot-noise-limited) polarimetric sensitivity can be enhanced by orders of magnitude leaving the photon flux incident onto the ph…
Effect of annealing on the hyperfine interaction in InAs/GaAs quantum dots
M. Yu. Petrov, I. V. Ignatiev, S. V. Poltavtsev +4
The hyperfine interaction of an electron with nuclei in the annealed self-assembled InAs/GaAs quantum dots is theoretically analyzed. For this purpose, the annealing process, and e…
Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
A. Greilich, R. Oulton, E. A. Zhukov +9
Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence…
Continuous time crystal in an electron-nuclear spin system: stability and melting of periodic auto-oscillations
A. Greilich, N. E. Kopteva, A. N. Kamenskii +3
Crystals spontaneously break the continuous translation symmetry in space, despite the invariance of the underlying energy function. This has triggered suggestions of time crystals…
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…
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…
Unveiling the electron-nuclear spin dynamics in an n-doped InGaAs epilayer by spin noise spectroscopy
C. Rittmann, M. Yu. Petrov, A. N. Kamenskii +6
We discuss the implications of a small indium content (3%) in a GaAs epilayer on the electron- and nuclear-spin relaxation due to enhanced quadrupolar effects induced by the strain…
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…