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Article
Open AccessInverted fine structure of a 6H-SiC qubit enabling robust spin-photon interface
Controllable solid-state spin qubits are currently becoming useful building blocks for applied quantum technologies. Here, we demonstrate that in a specific type of silicon-vacancy in the 6H-SiC polytype the e...
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Article
Effect of Mechanical Stress on the Splitting of Spin Sublevels in 4H-SiC
The effect of static mechanical strain on the splitting of spin sublevels of color centers based on spin 3/2 silicon vacancies in silicon carbide at room temperature has been shown. The deformed heterointerfac...
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Article
Open AccessExcitation and coherent control of spin qudit modes in silicon carbide at room temperature
One of the challenges in the field of quantum sensing and information processing is to selectively address and coherently manipulate highly homogeneous qubits subject to external perturbations. Here, we presen...
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Article
Room-Temperature Level Anticrossing and Cross-Relaxation Spectroscopy of Spin Color Centers in SiC Single Crystals and Nanostructures
A sharp variation of the near infrared photoluminescence intensity for spin-3/2 color centers in hexagonal (4H-, 6H-) and rhombic (15R-) SiC polytypes in the vicinity of level anticrossing (LAC) and cross-rela...
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Article
Open AccessObservation of the universal magnetoelectric effect in a 3D topological insulator
The electrodynamics of topological insulators (TIs) is described by modified Maxwell’s equations, which contain additional terms that couple an electric field to a magnetization and a magnetic field to a polar...
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Article
Open AccessOptical thermometry based on level anticrossing in silicon carbide
We report a giant thermal shift of 2.1 MHz/K related to the excited-state zero-field splitting in the silicon vacancy centers in 4H silicon carbide. It is obtained from the indirect observation of the opticall...
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Article
Spin Centres in SiC for Quantum Technologies
Atomic-scale colour centres in bulk and nanocrystalline SiC are promising for quantum information processing, photonics and sensing at ambient conditions. Their spin state can be initialized, manipulated and r...
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Article
An optical quantum magnetometer with submicron resolution based on the level anticrossing phenomenon
An optical quantum magnetometer with submicron spatial resolution is proposed that is based on the phenomenon of optical response in a solid-state spin system under conditions of spin sublevel anticrossing wit...
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Article
Engineering near-infrared single-photon emitters with optically active spins in ultrapure silicon carbide
Vacancy-related centres in silicon carbide are attracting growing attention because of their appealing optical and spin properties. These atomic-scale defects can be created using electron or neutron irradiati...
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Article
Point defects in silicon carbide as a promising basis for spectroscopy of single defects with controllable quantum states at room temperature
The spin and optical properties of silicon vacancy defects in silicon carbide of the hexagonal 6H polytype have been investigated using photoluminescence, electron paramagnetic resonance, and X-band optically det...
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Article
Open AccessMagnetic field and temperature sensing with atomic-scale spin defects in silicon carbide
Quantum systems can provide outstanding performance in various sensing applications, ranging from bioscience to nanotechnology. Atomic-scale defects in silicon carbide are very attractive in this respect becau...
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Article
Room-temperature quantum microwave emitters based on spin defects in silicon carbide
Atomic-scale defects in silicon carbide are always present and usually limit the performance of this material in high-power electronics and radiofrequency communication. Here, we reveal a family of homotypic s...
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Article
Open AccessSilicon carbide light-emitting diode as a prospective room temperature source for single photons
Generation of single photons has been demonstrated in several systems. However, none of them satisfies all the conditions, e.g. room temperature functionality, telecom wavelength operation, high efficiency, as...
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Article
Universal estimation of X- trion binding energy in semiconductor quantum wells
We have analyzed the binding energy (EBT) of negatively charged excitons (X-) in GaAs, CdTe and ZnSe quantum wells, which differ considerably in exciton and trion binding energy. Surprisingly, the EBT in these ma...
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Chapter and Conference Paper
Combined Exciton-Electron Optical Processes in Optical Spectra of Modulation Doped QWs
We present a detailed study of combined exciton-electron processes in modulation doped quantum well structures contain a 2DEG of low density. We observed resonance exciton-electron processes in magnetic fields...
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Chapter and Conference Paper
Positively and Negatively Charged Trions in ZnSe-Based Quantum Wells
Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies of negative...
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Chapter and Conference Paper
Optical Studies of Spin Polarized 2Deg in Modulation-Doped (Zn,Mn)Se/(Zn,Be)Se Quantum Wells in High Magnetic Fields
Optical properties of (Zn,Mn)Se/(Zn,Be)Se quantum wells containing a two-dimensional electron gas with densities varying from 109 to 5.5 × 1011 cm-2 have been studied in magnetic fields up to 45 T. A strong s — d
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Chapter and Conference Paper
II-VI Quantum Wells with High Carrier Densities and in High Magnetic Fields
Optical properties of a two-dimensional electron gas in ZnSe/(Zn,Be,Mg)Se quantum well structures have been examined by means of photoluminescence and reflectivity techniques in external magnetic fields up to ...
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Article
Inhomogeneous broadening of exciton lines in magneto-optical reflection from CdTe/CdMgTe quantum wells
A spectroscopic method is proposed to determine parameters of homogeneous and inhomogeneous broadening for excitons confined in semiconductor quantum wells with free carriers. By measuring the optical reflecti...
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Chapter
Combined Exciton-Electron Processes in Modulation Doped Quantum Well Structures
Combined exciton-electron processes were studied in modulation doped quantum well structures in magnetic fields. In the case of such combined processes an incident photon creates an exciton and induces a trans...
