Publications (123)
Magnetic field tuning of exciton polaritons in a semiconductor microcavity
B. Pietka, D. Zygmunt, M. Krol +11
We detail the influence of a magnetic field on exciton-polaritons inside a semiconductor microcavity. Magnetic field can be used as a tuning parameter for exciton and photon resona…
Magnon gap excitations in van der Waals antiferromagnet MnPSe
Dipankar Jana, D. Vaclavkova, I. Mohelsky +9
Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe. Experiments carried out as a function of temperature and the applied m…
Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure
I. Breslavetz, A. Delhomme, T. Pelini +6
We present an experimental set-up developed to perform optical spectroscopy experiments (Raman scattering and photoluminescence measurements) with a micrometer spatial resolution,…
Singlet and triplet trions in WS monolayer encapsulated in hexagonal boron nitride
D. Vaclavkova, J. Wyzula, K. Nogajewski +5
Embedding a WS monolayer in flakes of hexagonal boron nitride allowed us to resolve and study the photoluminescence response due to both singlet and triplet states of negativel…
Landau level spectroscopy of valence bands in HgTe quantum wells: Effects of symmetry lowering
L. S. Bovkun, A. V. Ikonnikov, V. Ya. Aleshkin +8
Landau level spectroscopy has been employed to probe the electronic structure of the valence band in a series of p-type HgTe/HgCdTe quantum wells with both normal and inverted orde…
Microwave magnetoplasmon absorption by a 2DEG stripe
O. M. Fedorych, S. Moreau, M. Potemski +3
Microwave absorption by a high mobility 2DEG has been investigated experimentally using sensitive Electron Paramagnetic Resonance cavity technique. It is found that MW absorption s…
Optical readout of charge and spin in a self-assembled quantum dot in a strong magnetic field
M. Korkusinski, P. Hawrylak, A. Babinski +3
We present a theory and experiment demonstrating optical readout of charge and spin in a single InAs/GaAs self-assembled quantum dot. By applying a magnetic field we create the fil…
Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers
C. Robert, B. Han, P. Kapuscinski +10
Excitons with binding energies of a few hundreds of meV control the optical properties of transition metal dichalcogenide monolayers. Knowledge of the fine structure of these excit…
Magneto-resistance quantum oscillations in a magnetic two-dimensional electron gas
J. Kunc, B. A. Piot, D. K. Maude +7
Magneto-transport measurements of Shubnikov-de Haas (SdH) oscillations have been performed on two-dimensional electron gases (2DEGs) confined in CdTe and CdMnTe quantum wells. The…
Quadexciton cascade and fine structure splitting of the triexciton in a single quantum dot
M. R. Molas, A. A. L. Nicolet, A. Babinski +1
We report the properties of emission lines associated with the cascaded recombination of a quadexciton in single GaAlAs/AlAs quantum dots, studied by means of polarization-resolved…
Magnon gap excitations and spin-entangled optical transition in van der Waals antiferromagnet NiPS3
Dipankar Jana, P. Kapuscinski, I. Mohelsky +5
Optical magneto-spectroscopy methods (Raman scattering, far-infrared transmission, and photoluminescence) have been applied to investigate the properties of the NiPS3 semiconductin…
The effect of metallic substrates on the optical properties of monolayer MoSe
M. Grzeszczyk, M. R. Molas, K. Nogajewski +6
Atomically thin materials, like semiconducting transition metal dichalcogenides (S-TMDs), are highly sensitive to the environment. This opens up an opportunity to externally contro…
Landau level spectroscopy of electron-electron interactions in graphene
C. Faugeras, S. Berciaud, P. Leszczynski +11
We present magneto-Raman scattering studies of electronic inter Landau level excitations in quasi-neutral graphene samples with different strengths of Coulomb interaction. The band…
Magnon-polarons in van der Waals antiferromagnet FePS3
D. Vaclavkova, M. Palit, J. Wyzula +11
The hybridization of magnons (spin waves) with phonons, if sufficiently strong and comprising long wavelength excitations, may offer a new playground when manipulating the magnetic…
Magneto-transmission of multi-layer epitaxial graphene and bulk graphite: A comparison
M. Orlita, C. Faugeras, G. Martinez +6
Magneto-transmission of a thin layer of bulk graphite is compared with spectra taken on multilayer epitaxial graphene prepared by thermal decomposition of a SiC crystal. We focus o…
Transverse and longitudinal magnons in strongly anisotropic antiferromagnet FePSe3
F. Le Mardele, A. El Mendili, M. E. Zhitomirsky +7
FePSe3 is a collinear honeycomb antiferromagnet with an easy-axis anisotropy and large spins S=2. It belongs to a family of magnetic van der Waals materials, which recently attract…
Experimental approval of the extended flat bands and gapped subbands in rhombohedral multilayer graphene
Y. Henni, H. P. Ojeda Collado, K. Nogajewski +6
Graphene layers are known to stack in two stable configurations, namely ABA or ABC stacking, with drastically distinct electronic properties. Unlike the ABA stacking, little has be…
Magneto-optical readout of dark exciton distribution in cuprous oxide
D. Fishman, C. Faugeras, M. Potemski +2
An experimental study of the yellow exciton series in Cu2O in strong magnetic fields up to 32 T shows the optical activation of direct and phonon-assisted paraexciton luminescence…
Strong interband Faraday rotation in 3D topological insulator Bi2Se3
L. Ohnoutek, M. Hakl, M. Veis +11
The Faraday effect is a representative magneto-optical phenomenon, resulting from the transfer of angular momentum between interacting light and matter in which time-reversal symme…
A consistent interpretation of the low temperature magneto-transport in graphite using the Slonczewski--Weiss--McClure 3D band structure calculations
J. M. Schneider, M. Orlita, M. Potemski +1
Magnetotransport of natural graphite and highly oriented pyrolytic graphite (HOPG) has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers ar…
Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity
M. Król, K. Lekenta, R. Mirek +8
Monolayer transition metal dichalcogenides, known for exhibiting strong excitonic resonances, constitute a very interesting and versatile platform for investigation of light-matter…
Magneto-optical signature of massless Kane electrons in Cd3As2
A. Akrap, M. Hakl, S. Tchoumakov +21
We report on optical reflectivity experiments performed on Cd3As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of…
Resonant Excitation of Graphene K-Phonon and Intra-Landau-Level Excitons in Magneto-Optical Spectroscopy
M. Orlita, Liang Z. Tan, M. Potemski +5
Precise infrared magnetotransmission experiments have been performed in magnetic fields up to 32 T on a series of multilayer epitaxial graphene samples. We observe changes in the s…
From laterally modulated two-dimensional electron gas towards artificial graphene
L. Nadvornik, M. Orlita, N. A. Goncharuk +8
Cyclotron resonance has been measured in far-infrared transmission of GaAs/AlGaAs heterostructures with an etched hexagonal lateral superlattice. Non-linear dependence…
Fractional quantum Hall effect in CdTe
B. A. Piot, J. Kunc, M. Potemski +6
The fractional quantum Hall (FQH) effect is reported in a high mobility CdTe quantum well at mK temperatures. Fully-developed FQH states are observed at filling factor 4/3 and 5/3…
The optical response of artificially twisted MoS bilayers
M. Grzeszczyk, J. Szpakowski, A. O. Slobodeniuk +8
Two-dimensional layered materials offer the possibility to create artificial vertically stacked structures possessing an additional degree of freedom - .…
Optical absorption to probe the quantum Hall ferromagnet at filling factor
P. Plochocka, J. M. Schneider, D. K. Maude +7
Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at fillin…
Landau level spectroscopy of ultrathin graphite layers
M. L. Sadowski, G. Martinez, M. Potemski +2
Far infrared transmission experiments are performed on ultrathin epitaxial graphite samples in a magnetic field. The observed cyclotron resonance-like and electron-positron-like tr…
Magneto-optics of massive Dirac fermions in bulk Bi2Se3
M. Orlita, B. A. Piot, G. Martinez +13
We report on magneto-optical studies of Bi2Se3, a representative member of the 3D topological insulator family. Its electronic states in bulk are shown to be well described by a si…
Quantum Hall states under conditions of vanishing Zeeman energy
F. J. Teran, M. Potemski, D. K. Maude +4
We report on magneto-transport measurements of a two-dimensional electron gas confined in a CdMnTe quantum well structure under conditions of vanishing Zeeman e…
Raman scattering from the bulk inactive out-of-plane B mode in few-layer MoTe
M. Grzeszczyk, K. GoÅasa, M. R. Molas +5
Raman scattering from the out-of-plane vibrational modes (A/A'), which originate from the bulk-inactive out-of-plane B mode, are studied in fe…
Microwave absorption/reflection and magneto-transport experiments on high-mobility electron gas
S. A. Studenikin, M. Potemski, A. Sachrajda +3
We have performed simultaneous measurements of microwave absorption/reflection and magneto-transport characteristics of a high mobility two-dimensional electrons in GaAs/AlGaAs het…
Quantum oscillations in the microwave magnetoabsorption of a 2D electron gas
O. M. Fedorych, M. Potemski, S. A. Studenikin +3
We report on the experimental observation of the quantum oscillations in microwave magnetoabsorption of a high-mobility two-dimensional electron gas induced by Landau quantization.…
Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
J. Binder, J. Howarth, F. Withers +11
The intriguing physics of carrier-carrier interactions, which likewise affect the operation of light emitting devices, stimulate the research on semiconductor structures at high de…
Quality heterostructures from two dimensional crystals unstable in air by their assembly in inert atmosphere
Y. Cao, A. Mishchenko, G. L. Yu +16
Many layered materials can be cleaved down to individual atomic planes, similar to graphene, but only a small minority of them are stable under ambient conditions. The rest reacts…
High-Energy Limit of Massless Dirac Fermions in Multilayer Graphene using Magneto-Optical Transmission Spectroscopy
P. Plochocka, C. Faugeras, M. Orlita +7
We have investigated the absorption spectrum of multilayer graphene in high magnetic fields. The low energy part of the spectrum of electrons in graphene is well described by the r…
Breathing modes in few-layer MoTe activated by h-BN encapsulation
M. Grzeszczyk, M. R. Molas, M. Bartoš +3
The encapsulation of few-layer transition metal dichalcogenides (TMDs) in hexagonal boron nitride (h-BN) is known to improve significantly their optical and electronic properties.…
Magneto infra-red absorption in high electronic density GaAs quantum wells
A. J. L. Poulter, J. Zeman, D. K. Maude +5
Magneto infra-red absorption measurements have been performed in a highly doped GaAs quantum well which has been lifted off and bonded to a silicon substrate, in order to study the…
Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures
J. R. Wallbank, D. Ghazaryan, A. Misra +15
Chirality is a fundamental property of electrons with the relativistic spectrum found in graphene and topological insulators. It plays a crucial role in relativistic phenomena, suc…
Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
M. Zinkiewicz, M. Grzeszczyk, T. Kazimierczuk +10
Raman scattering excitation (RSE) is an experimental technique in which the spectrum is made up by sweeping the excitation energy when the detection energy is fixed. We study the l…
Collective character of spin excitations in a system of Mn spins coupled to a two-dimensional electron gas
F. J. Teran, M. Potemski, D. K. Maude +7
We have studied the low energy spin excitations in n-type CdMnTe based dilute magnetic semiconductor quantum wells. For magnetic fields for which the energies for the excitation of…
Enhancement of the spin-gap in fully occupied two-dimensional Landau levels
J. Kunc, K. Kowalik, F. J. Teran +7
Polarization-resolved magneto-luminescence, together with simultaneous magneto-transport measurements, have been performed on a two-dimensional electron gas (2DEG) confined in CdTe…
The temperature influence on the brightening of neutral and charged dark excitons in WSe monolayer
Å. Kipczak, N. Zawadzka, D. Jana +9
The optically dark states play an important role in the electronic and optical properties of monolayers (MLs) of semiconducting transition metal dichalcogenides. The effect of temp…
Circular dichroism of magneto-phonon resonance in doped graphene
P. Kossacki, C. Faugeras, M. Kühne +6
Polarization resolved, Raman scattering response due to E phonon in monolayer graphene has been investigated in magnetic fields up to 29 T. The hybridization of the E…
Multiple magneto-phonon resonances in graphene
D. M. Basko, P. Leszczynski, C. Faugeras +5
Our low-temperature magneto-Raman scattering measurements performed on graphene-like locations on the surface of bulk graphite reveal a new series of magneto-phonon resonances invo…
Tuning valley polarization in a WSe2 monolayer with a tiny magnetic field
T. SmoleÅski, M. Goryca, M. Koperski +5
In monolayers of semiconducting transition metal dichalcogenides, the light helicity ( or ) is locked to the valley degree of freedom, leading to the possibility of opt…
Raman scattering in few-layer MoTe
M. Grzeszczyk, K. GoÅasa, M. Zinkiewicz +5
We report on room-temperature Raman scattering measurements in few-layer crystals of exfoliated molybdenum ditelluride (MoTe) performed with the use of 632.8 nm (1.96 eV) las…
Plasmonic terahertz detectors based on a high-electron mobility GaAs/AlGaAs heterostructure
M. BiaÅek, A. M. Witowski, M. Orlita +6
In order to characterize magnetic-field (B) tunable THz plasmonic detectors, spectroscopy experiments were carried out at liquid helium temperatures and high magnetic fields on dev…
Effect of a magnetic field on the two-phonon Raman scattering in graphene
C. Faugeras, P. Kossacki, D. M. Basko +5
We have studied, both experimentally and theoretically, the change of the so-called 2D band of the Raman scattering spectrum of graphene (the two-phonon peak near 2700 cm-1) in an…
Dirac electronic states in graphene systems: Optical spectroscopy studies
M. Orlita, M. Potemski
Electronic properties of two-dimensional allotropes of carbon, such as graphene and its bilayer, multi-layer epitaxial graphene, few-layer Bernal-stacked graphene, as well as of th…
Frequency quenching of microwave induced resistance oscillations in a high mobility two-dimensional electron gas
S. A. Studenikin, A. S. Sachrajda, J. A. Gupta +8
The frequency dependence of microwave-induced resistance oscillations (MIROs) has been studied experimentally in high-mobility electron GaAs/AlGaAs structures to explore the limits…
Thermal conductivity of graphene in Corbino membrane geometry
C. Faugeras, B. Faugeras, M. Orlita +3
Local laser excitation and temperature readout from the intensity ratio of Stokes to anti-Stokes Raman scattering signals are employed to study the thermal properties of a large gr…
Bilayer graphene inclusions in rotational-stacked multilayer epitaxial graphene
M. Orlita, C. Faugeras, J. Borysiuk +8
Additional component in multi-layer epitaxial graphene grown on the C-terminated surface of SiC, which exhibits the characteristic electronic properties of a AB-stacked graphene bi…
Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS
P. KapuÅciÅski, J. Dzian, A. O. Slobodeniuk +6
We perform a polarization-resolved magnetoluminescence study of excitons in ReS. We observe that two linearly polarized Rydberg series of excitons are accompanied by two other…
Carrier scattering from dynamical magneto-conductivity in quasi-neutral epitaxial graphene
M. Orlita, C. Faugeras, R. Grill +6
The energy-dependence of the electronic scattering time is probed by Landau level spectroscopy in quasi neutral multilayer epitaxial graphene. From the Landau levels broadening we…
Microwave radiation induced magneto-oscillations in the longitudinal and transverse resistance of a two dimensional electron gas
S. A. Studenikin, M. Potemski, P. T. Coleridge +2
We confirm the existance of magneto-resistance oscillations in a microwave-irradiated two-dimensional electron gas, first reported in a series of papers by Zhudov et al. and Mani e…
Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
J. M. Schneider, M. Orlita, M. Potemski +1
Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calcula…
Fine structure of -excitons in multilayers of transition metal dichalcogenides
A. O. Slobodeniuk, Å. Bala, M. Koperski +8
Reflectance and magneto-reflectance experiments together with theoretical modelling based on the approach have been employed to study the evolution of direct ba…
Tuning the electron-phonon coupling in multilayer graphene with magnetic fields
C. Faugeras, M. Amado, P. Kossacki +5
Magneto Raman scattering study of the E optical phonons in multi-layer epitaxial graphene grown on a carbon face of SiC are presented. At 4.2K in magnetic field up to 33 T,…
Quasi-classical cyclotron resonance of Dirac fermions in highly doped graphene
A. M. Witowski, M. Orlita, R. Stepniewski +6
Cyclotron resonance in highly doped graphene has been explored using infrared magnetotransmission. Contrary to previous work, which only focused on the magneto-optical properties o…
Sub-bandgap voltage electroluminescence and magneto-oscillations in a WSe2 light-emitting van der Waals heterostructure
J. Binder, F. Withers, M. R. Molas +8
We report on experimental investigations of an electrically driven WSe2 based light-emitting van der Waals heterostructure. We observe a threshold voltage for electroluminescence s…
Magnetospectroscopy of epitaxial few-layer graphene
M. L. Sadowski, G. Martinez, M. Potemski +2
The inter-Landau level transitions observed in far-infrared transmission experiments on few-layer graphene samples show a behaviour characteristic of the linear dispersion expected…
Neutral and charged dark excitons in monolayer WS
M. Zinkiewicz, A. O. Slobodeniuk, T. Kazimierczuk +12
Low temperature and polarization resolved magneto-photoluminescence experiments are used to investigate the properties of dark excitons and dark trions in a monolayer of WS enc…
Polarization resolved magneto-Raman scattering of graphene-like domains on natural graphite
M. Kuhne, C. Faugeras, P. Kossacki +4
The micro-Raman scattering response of a graphene-like location on the surface of bulk natural graphite is investigated both at $T=\unit{4.2}{K}$ and at room temperature in magneti…
The microwave induced resistance response of a high mobility 2DEG from the quasi-classical limit to the quantum Hall regime
S. A. Studenikin, M. Byszewski, D. K. Maude +6
Microwave induced resistance oscillations (MIROs) were studied experimentally over a very wide range of frequencies ranging from ~20 GHz up to ~4 THz, and from the quasi-classical…
Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
M. R. Molas, C. Faugeras, A. O. Slobodeniuk +4
We present low temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field applied to monolayers of diffe…
Energy spectrum of confined positively charged excitons in single quantum dots
M. R. Molas, A. Wojs, A. A. L. Nicolet +2
A theoretical model, which relates the binding energy of a positively charged exciton in a quantum dot with the confinement energy is presented. It is shown that the binding energy…
Hybrid electroluminescent devices composed of (In,Ga)N micro-LEDs and monolayers of transition metal dichalcogenides
K. Oreszczuk, J. Slawinska, A. Rodek +3
We demonstrate a novel electro-luminescence device in which GaN-based -LEDs are used to trigger the emission spectra of monolayers of transition metal dichalcogenides, which ar…
Electronic excitations and electron-phonon coupling in bulk graphite through Raman scattering in high magnetic fields
P. Kossacki, C. Faugeras, M. Kühne +6
We use polarized magneto-Raman scattering to study purely electronic excitations and the electron-phonon coupling in bulk graphite. At a temperature of 4.2 K and in magnetic fields…
Tuning THz magnons in a mixed van-der-Waals antiferromagnet
F. Le Mardele, I. Mohelsky, D. Jana +9
Alloying stands out as a pivotal technological method employed across various compounds, be they metallic, magnetic, or semiconducting, serving to fine-tune their properties to mee…
Excitonic complexes in -doped WS monolayer
M. Zinkiewicz, T. Woźniak, T. Kazimierczuk +12
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of -doped WS monolayer embedded in hexagonal BN layers using external m…
The hole Fermi surface in BiSe probed by quantum oscillations
B. A. Piot, W. Desrat, D. K. Maude +4
Transport and torque magnetometry measurements are performed at high magnetic fields and low temperatures in a series of p-type (Ca-doped) BiSe crystals. The angular de…
Magneto-optical sensing of the pressure driven magnetic ground states in bulk CrSBr
A. Pawbake, T. Pelini, I. Mohelsky +13
Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can fu…
Hierarchy of Hofstadter states and replica quantum Hall ferromagnetism in graphene superlattices
G. L. Yu, R. V. Gorbachev, J. S. Tu +16
Self-similarity and fractals have fascinated researchers across various disciplines. In graphene placed on boron nitride and subjected to a magnetic field, self-similarity appears…
Single photon emitters in exfoliated WSe2 structures
M. Koperski, K. Nogajewski, A. Arora +3
Crystal structure imperfections in solids often act as efficient carrier trapping centers which, when suitably isolated, act as sources of single photon emission. The best known ex…
Flipping exciton angular momentum with chiral phonons in MoSe/WSe heterobilayers
A. Delhomme, D. Vaclavkova, A. Slobodeniuk +11
Identifying quantum numbers to label elementary excitations is essential for the correct description of light-matter interaction in solids. In monolayer semiconducting transition m…
Impact of environment on dynamics of exciton complexes in a WS monolayer
T. Jakubczyk, K. Nogajewski, M. R. Molas +4
Scientific curiosity to uncover original optical properties and functionalities of atomically thin semiconductors, stemming from unusual Coulomb interactions in the two-dimensional…
Lorentz-boost-driven magneto-optics in a Dirac nodal-line semimetal
J. Wyzula, X. Lu, D. Santos-Cottin +13
Optical response of crystalline solids is to a large extent driven by excitations that promote electrons among individual bands. This allows one to apply optical and magneto-optica…
Brightening of dark excitons in a single quantum dot containing a single magnetic ion
M. Goryca, P. Plochocka, T. Kazimierczuk +5
A promising method to investigate dark exciton transitions in quantum dots is presented. The optical recombination of the dark exciton is allowed when the exciton state is coupled…
A micro-magneto-Raman scattering study of graphene on a bulk graphite substrate
C. Faugeras, J. Binder, A. A. L. Nicolet +5
We report on a magneto-Raman scattering study of graphene flakes located on the surface of a bulk graphite substrate. By spatially mapping the Raman scattering response of the surf…
Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale Monolayer Graphene
I. Crassee, M. Orlita, M. Potemski +6
We show that in graphene epitaxially grown on SiC the Drude absorption is transformed into a strong terahertz plasmonic peak due to natural nanoscale inhomogeneities, such as subst…
Valley polarization of singlet and triplet trions in WS monolayer in magnetic fields
P. KapuÅciÅski, D. Vaclavkova, M. Grzeszczyk +9
The spectral signatures associated with different negatively charged exciton complexes (trions) in a WS monolayer encapsulated in hBN, are analyzed from low temperature and pol…
The energy scale of Dirac electrons in Cd3As2
M. Hakl, S. Tchoumakov, I. Crassee +15
Cadmium arsenide (Cd3As2) has recently became conspicuous in solid-state physics due to several reports proposing that it hosts a pair of symmetry-protected 3D Dirac cones. Despite…
Cloning of Dirac fermions in graphene superlattices
L. A. Ponomarenko, R. V. Gorbachev, G. L. Yu +15
Lateral superlattices have attracted major interest as this may allow one to modify spectra of two dimensional electron systems and, ultimately, create materials with tailored elec…
How perfect can graphene be?
P. Neugebauer, M. Orlita, C. Faugeras +2
Fabrication of graphene structures has triggered vast research efforts focused on the properties of two-dimensional systems with massless Dirac fermions. Nevertheless, further prog…
Non-linear exciton spin-splitting in single InAs/GaAs self-assembled quantum structures in ultrahigh magnetic fields
A. Babinski, G. Ortner, S. Raymond +6
We report on the magnetic field dispersion of the exciton spin-splitting and diamagnetic shift in single InAs/GaAs quantum dots (QDs) and dot molecules (QDMs) up to = 28 T. Onl…
Microwave induced resistance oscillations on a high-mobility 2DEG: absorption/reflection and temperature damping experiments
S. A. Studenikin, M. Potemski, A. Sachrajda +3
In this work we address experimentally a number of unresolved issues related to microwave induced resistance oscillations (MIRO) and the zero-resistance states observed recently on…
Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots
J. Kobak, T. SmoleÅski, M. Goryca +13
We present a comparative study of two self-assembled quantum dot (QD) systems based on II-VI compounds: CdTe/ZnTe and CdSe/ZnSe. Using magneto-optical techniques we investigated a…
Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
M. R. Molas, A. O. Slobodeniuk, K. Nogajewski +7
We demonstrate that, in monolayers (MLs) of semiconducting transition metal dichalcogenides, the -type Rydberg series of excitonic states follows a simple energy ladder: $ε_n=-…
Fine structure of "zero-mode" Landau levels in HgTe/HgCdTe quantum wells
M. Orlita, K. Masztalerz, C. Faugeras +5
HgTe/HgCdTe quantum wells with the inverted band structure have been probed using far infrared magneto-spectroscopy. Realistic calculations of Landau level diagrams have been perfo…
Exciton-polaritons in multilayer WSe in a planar microcavity
M. Król, K. RechciÅska, K. Nogajewski +10
Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled lig…
Enhancement of electron magnetic susceptibility due to many-body interactions in monolayer MoSe
K. Oreszczuk, A. Rodek, M. Goryca +7
Employing the original, all-optical method, we quantify the magnetic susceptibility of a two-dimensional electron gas (2DEG) confined in the MoSe monolayer in the range of low…
Magneto-Raman scattering of graphene on graphite: Electronic and phonon excitations
C. Faugeras, M. Amado, P. Kossacki +5
Magneto-Raman scattering experiments from the surface of graphite reveal novel features associated to purely electronic excitations which are observed in addition to phonon-mediate…
Cyclotron-resonant exciton transfer between the nearly free and strongly localized radiative states of a two-dimensional hole gas in a high magnetic field
L. Bryja, J. Jadczak, A. Wojs +7
Avoided crossing of the emission lines of a nearly free positive trion and a cyclotron replica of an exciton bound to an interface acceptor has been observed in the magneto-photolu…
Slowing hot carrier relaxation in graphene using a magnetic field
P. Plochocka, P. Kossacki, A. Golnik +4
A degenerate pump--probe technique is used to investigate the non equilibrium carrier dynamics in multi--layer graphene. Two distinctly different dynamics of the carrier relaxation…
Photoluminescence investigations of 2D hole Landau levels in p-type single Al_{x}Ga_{1-x}As/GaAs heterostructures
M. Kubisa, L. Bryja, K. Ryczko +7
We study the energy structure of two-dimensional holes in p-type single Al_{1-x}Ga_{x}As/GaAs heterojunctions under a perpendicular magnetic field. Photoluminescence measurments wi…
Electrical switch to the resonant magneto-phonon effect in graphene
P. Leszczynski, Z. Han, A. A. L. Nicolet +7
We report a comprehensive study of the tuning with electric fields of the resonant magneto-exciton optical phonon coupling in gated graphene. For magnetic fields around …
Optical properties of atomically thin transition metal dichalcogenides: Observations and puzzles
M. Koperski, M. R. Molas, A. Arora +4
Recent results on the optical properties of mono- and few-layers of semiconducting transition metal dichalcogenides are reviewed. Experimental observations are presented and discus…
Resonant quenching of Raman scattering due to out-of-plane A/A' modes in few-layer MoTe
K. GoÅasa, M. Grzeszczyk, M. R. Molas +6
Temperature-dependent (5 K to 300 K) Raman scattering study of A/A' phonon modes in mono-layer (1L), bilayer (2L), trilayer (3L), and tetralayer (4L) MoTe is reporte…
Dirac fermions at the H point of graphite: Magneto-transmission studies
M. Orlita, C. Faugeras, G. Martinez +3
We report on far infrared magneto-transmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In magnetic field, absorption l…