D. Kudlacik
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View article: Antiferromagnetic nonreciprocity of light emission in CuB$_2$O$_4$
Antiferromagnetic nonreciprocity of light emission in CuB$_2$O$_4$ Open
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 the crystal symmetry with respect to time-reversal. Such viol…
View article: Dynamic polarization of nuclear spins by optically-oriented electrons and holes in lead halide perovskite semiconductors
Dynamic polarization of nuclear spins by optically-oriented electrons and holes in lead halide perovskite semiconductors Open
A theory of dynamic polarization of the nuclear spin system via optically-oriented charge carriers in lead halide perovskites is developed and compared with the experiments performed on a FA$_{0.9}$Cs$_{0.1}$PbI$_{2.8}$Br$_{0.2}$ crystal. …
View article: Confined Acoustic Phonons in CsPbI<sub>3</sub> Nanocrystals Explored by Resonant Raman Scattering on Excitons
Confined Acoustic Phonons in CsPbI<sub>3</sub> Nanocrystals Explored by Resonant Raman Scattering on Excitons Open
Optical properties of the lead halide perovskite nanocrystals are controlled by confined excitons and a rich spectrum of confined acoustic and optical phonons. We study experimentally and theoretically the exciton-phonon interaction in CsP…
View article: Magnetic field induced exciton spin dynamics in indirect band gap (In,Al)As/AlAs quantum dots
Magnetic field induced exciton spin dynamics in indirect band gap (In,Al)As/AlAs quantum dots Open
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 band alignment. The magnetic-field-induced circular polari…
View article: Landé g-factors and spin dynamics of charge carriers in CuCl nanocrystals in a glass matrix
Landé g-factors and spin dynamics of charge carriers in CuCl nanocrystals in a glass matrix Open
The spin properties of charge carriers confined in CuCl semiconductor nanocrystals (NCs) of different sizes (radius from 1.8 nm up to 28 nm) crystallized in a glass matrix are studied experimentally and theoretically. By means of photolumi…
View article: Highly‐Polarized Emission Provided by Giant Optical Orientation of Exciton Spins in Lead Halide Perovskite Crystals
Highly‐Polarized Emission Provided by Giant Optical Orientation of Exciton Spins in Lead Halide Perovskite Crystals Open
Quantum technologic and spintronic applications require reliable material platforms that enable significant and long‐living spin polarization of excitations, the ability to manipulate it optically in external fields, and the possibility to…
View article: Optical spin orientation of localized electrons and holes interacting with nuclei in an FA$_{0.9}$Cs$_{0.1}$PbI$_{2.8}$Br$_{0.2}$ perovskite crystal
Optical spin orientation of localized electrons and holes interacting with nuclei in an FA$_{0.9}$Cs$_{0.1}$PbI$_{2.8}$Br$_{0.2}$ perovskite crystal Open
Optical orientation of carrier spins by circularly polarized light is the basic concept and tool of spin physics in semiconductors. We study the optical orientation of electrons and holes in a crystal of the FA$_{0.9}$Cs$_{0.1}$PbI$_{2.8}$…
View article: Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences
Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences Open
The optical properties of lead halide perovskite semiconductors in vicinity of the bandgap are controlled by excitons, so that investigation of their fundamental properties is of critical importance. The exciton Landé or g-factor gX is the…
View article: Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences
Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences Open
The optical properties of lead halide perovskite semiconductors in vicinity of the bandgap are controlled by excitons, so that investigation of their fundamental properties is of critical importance. The exciton Landé or g ‐factor g X is t…
View article: Universal magnetic proximity effect in ferromagnet–semiconductor quantum well hybrid structures
Universal magnetic proximity effect in ferromagnet–semiconductor quantum well hybrid structures Open
Hybrid ferromagnet–semiconductor systems possess new outstanding properties, which emerge when bringing magnetic and semiconductor materials into contact. In such structures, the long-range magnetic proximity effect couples the spin system…
View article: Giant optical orientation of exciton spins in lead halide perovskite crystals
Giant optical orientation of exciton spins in lead halide perovskite crystals Open
Optical orientation of carrier spins by circularly polarized light is the basis of spin physics in semiconductors. Here, we demonstrate strong optical orientation of 85\%, approaching the ultimate limit of unity, for excitons in FA$_{0.9}$…
View article: Spin‐Flip Raman Scattering on Electrons and Holes in Two‐Dimensional (PEA)<sub>2</sub>PbI<sub>4</sub> Perovskites
Spin‐Flip Raman Scattering on Electrons and Holes in Two‐Dimensional (PEA)<sub>2</sub>PbI<sub>4</sub> Perovskites Open
The class of Ruddlesden–Popper type (PEA) 2 PbI 4 perovskites comprises 2D structures whose optical properties are determined by excitons with a large binding energy of about 260 meV. It complements the family of other 2D semiconductor mat…
View article: Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $α$-MnTe
Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $α$-MnTe Open
We report on time-resolved optical and terahertz ultrafast spectroscopy of charge-carrier dynamics in the room-temperature antiferromagnetic semiconductor $α$-MnTe. By optically pumping the system with 1.55 eV photons at room temperature, …
View article: Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment
Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment Open
Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs preve…
View article: Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA)$_2$PbI$_4$ Perovskites
Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA)$_2$PbI$_4$ Perovskites Open
The versatile potential of lead halide perovskites and two-dimensional materials is merged in the Ruddlesen-Popper perovskites having outstanding optical properties. Here, the coherent spin dynamics in Ruddlesen-Popper (PEA)$_2$PbI$_4$ per…
View article: Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites
Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites Open
The outstanding optical quality of lead halide perovskites inspires studies of their potential for the optical control of carrier spins as pursued in other materials. Entering largely uncharted territory, time‐resolved pump–probe Kerr rota…
View article: Steplike spectral distribution of photoelectrons at the percolation threshold in heavily <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-doped GaAs
Steplike spectral distribution of photoelectrons at the percolation threshold in heavily -doped GaAs Open
We study the origin of the step-like shoulder on the high energy side of the low temperature photoluminescence spectrum of heavily $p$-doped GaAs. We show experimentally that it is controlled by the Fermi-Dirac distribution of the holes an…
View article: Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets
Magneto-Optics of Excitons Interacting with Magnetic Ions in CdSe/CdMnS Colloidal Nanoplatelets Open
Excitons in diluted magnetic semiconductors represent excellent probes for studying the magnetic properties of these materials. Various magneto-optical effects, which depend sensitively on the exchange interaction of the excitons with the …
View article: Single and Double Electron Spin-Flip Raman Scattering in CdSe Colloidal Nanoplatelets
Single and Double Electron Spin-Flip Raman Scattering in CdSe Colloidal Nanoplatelets Open
CdSe colloidal nanoplatelets are studied by spin-flip Raman scattering in magnetic fields up to 5 T. We find pronounced Raman lines shifted from the excitation laser energy by an electron Zeeman splitting. Their polarization selection rule…
View article: Low voltage control of exchange coupling in a ferromagnet-semiconductor quantum well hybrid structure
Low voltage control of exchange coupling in a ferromagnet-semiconductor quantum well hybrid structure Open
Voltage control of ferromagnetism on the nanometer scale is highly appealing for the development of novel electronic devices with low power consumption, high operation speed, reliable reversibility and compatibility with semiconductor tech…
View article: Basic requirements of spin-flip Raman scattering on excitonic resonances and its modulation through additional high-energy illumination in semiconductor heterostructures
Basic requirements of spin-flip Raman scattering on excitonic resonances and its modulation through additional high-energy illumination in semiconductor heterostructures Open
We describe the major requirements to experimentally perform and observe resonant spin-flip Raman scattering on excitonic resonances in low-dimensional semiconductors. We characterize in detail the properties of this resonant light scatter…
View article: Observation of three-particle complexes in WS$_2$ monolayers
Observation of three-particle complexes in WS$_2$ monolayers Open
Atomically thin semiconducting transition-metal dichalcogenides provide novel insights into the physics of many-body effects mediated by Coulomb interactions. Here, we report on temperature-dependent ($T$ = 7-295 K) reflectance contrast an…