A5064802990- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Spectroscopy and Quantum Chemical Studies
- Quantum optics and atomic interactions
- Electronic and Structural Properties of Oxides
- Quantum and electron transport phenomena
- Machine Learning in Materials Science
- Strong Light-Matter Interactions
- Molecular Junctions and Nanostructures
- Advanced Fiber Laser Technologies
- ZnO doping and properties
- Electrochemical Analysis and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Analytical Chemistry and Sensors
- Nanowire Synthesis and Applications
- Phase-change materials and chalcogenides
- Photoreceptor and optogenetics research
- Transition Metal Oxide Nanomaterials
University of Warsaw
2017-2025
Monolayer transition-metal dichalcogenides (TMDs) manifest exceptional optical properties related to narrow excitonic resonances. However, these have been so far explored only for structures produced by techniques inducing considerable large-scale inhomogeneity. In contrast, which are essentially free from this disadvantage, such as molecular beam epitaxy (MBE), date yielded characterized spectral broadening, hinders most of the interesting effects. Here, we report first time on MBE-grown...
Optically detected magnetic resonance (ODMR) is a useful technique for studying interactions between local spins (magnetic ions) and the carrier gas. We present an ODMR study of single <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mo>(</a:mo><a:mtext>Cd</a:mtext><a:mtext>,</a:mtext><a:mtext>Mn</a:mtext><a:mo>)</a:mo><a:mtext>Te</a:mtext><a:mo>/</a:mo><a:mo>(</a:mo><a:mtext>Cd</a:mtext><a:mtext>,</a:mtext><a:mtext>Mg</a:mtext><a:mo>)</a:mo><a:mtext>Te</a:mtext></a:math> quantum...
Using a novel approach to ultrafast resonant pump-probe spectroscopy we investigate the spectral shape and dynamics of absorption features related A exciton in an hBN/MoSe$_2$/hBN van der Waals heterostructure. While pure two-level system experiment measures occupation or polarization dynamics, depending on time ordering pulse pair, transition metal dichalcogenide (TMD) both quantities get thoroughly mixed by strong exciton-exciton interaction. We find that for short positive delays lines...
Optically detected magnetic resonance (ODMR) is a useful technique for studying interactions between local spins (magnetic ions) and carrier gas. We present the ODMR study of single (Cd,Mn)Te/(Cd,Mg)Te quantum wells (QWs) with hole observe different characteristics signals obtained simultaneously using optical neutral positively charged exciton. From that, we infer an existence fluctuations gas density resulting in separate populations Mn$^{2+}$ ions. At same time, shape signal contains...
By performing ultrafast nonlinear spectroscopy, we assess the optical coherence of MoSe 2 monolayers grown by molecular beam epitaxy.
In this paper, we apply the angle-resolved Optically Detected Magnetic Resonance (ODMR) technique to study series of strained (Cd, Mn)Te/(Cd, Mg)Te quantum wells (QWs) produced by molecular beam epitaxy. By analyzing characteristic features ODMR angular scans, determine strain-induced axial-symmetry spin Hamiltonian parameter D with neV precision. Furthermore, use low-temperature optical reflectivity measurements and X-ray diffraction scans evaluate local strain present in QW material. our...
Wurtzite CdTe and (Cd,Mn)Te nanowires embedded in (Cd,Mg)Te shells are grown by employing vapour–liquid–solid growth mechanism a system for molecular beam epitaxy. A combined study involving cathodoluminescence, transmission electron microscopy micro-photoluminescence is used to correlate optical structural properties these structures. Typical features of excitonic emission from individual wurtzite highlighted including the energy 1.65 eV, polarization appearance B-exciton related at high...
Abstract We report on the magneto-photoluminescence of (Cd,Mn)Te/(Cd,Mg)Te quantum wells excited by photons with varied energy. observe that laser illumination modifies carrier density and Coulomb disorder in wells. Three different regimes are analyzed, corresponding to low hole disorder, significant high density. By using diluted magnetic semiconductor as a well material, we can induce spin singlet–triplet transition charged excitons field. This is then used tool determine exciton...
This study examines the spin-lattice relaxation rate of Mn$^{2+}$ ions in strained diluted magnetic semiconductor (Cd,Mn)Te/(Cd,Mg)Te quantum wells using optically detected resonance (ODMR) technique. By adjusting magnesium (Mg) content buffer layer, we created samples with different strain levels. Our time-resolved ODMR results show that time becomes faster as increases. We also found increases both field and temperature, showing a power-law behavior. To understand these observations, used...
We present the basic properties of a new physical system: an individual V2+ ion embedded into quantum dot. The system is realized utilizing molecular beam epitaxy and it observed using low-temperature polarization-resolved magneto-photoluminescence. nature confirmed by observation excitonic lines split due to interactions vanadium with carriers confined in CdTe/ZnTe Observed data are explained numerical modeling which includes s,p-d exchange interaction, Zeeman splitting exciton ion,...
Time-resolved optically detected magnetic resonance (ODMR) is a valuable technique to study the local deformation of crystal lattice around ion as well spin relaxation time. Here we utilize selective Mn-doping additionally enhance inherent locality ODMR technique. We present time-resolved studies single {(Cd,Mg)Te/(Cd,Mn)Te} quantum wells (QWs) with manganese ions located at different positions along growth axis -- in center or on sides well. observe that spin-lattice Mn$^{2+}$ significantly...
Coupled low dimensional structures have potential applications in quantum computing and spintronics.Using molecular beam epitaxy we fabricated three kinds of systems coupled wells dots with different energy order: at higher than dots, resonant structures, wells.By analysis photoluminescence reflectivity spectra, conclude that there is a possibility effective carrier tunneling between which opens subsequent testing spin transfer efficiency.
Using four-wave mixing microscopy, we measure the coherent response and ultrafast dynamics of excitons trions in MoSe$_2$ monolayers grown by molecular beam epitaxy on thin films hexagonal boron nitride. We assess inhomogeneous homogeneous broadenings transition spectral lineshape. The impact phonons dephasing is inferred via temperature dependence dephasing. Four-wave mapping, combined with atomic force reveals spatial correlations between exciton oscillator strength, broadening sample...
Time-resolved optically detected magnetic resonance (ODMR) is a valuable technique to study the local deformation of crystal lattice around ion as well spin relaxation time. Here we utilize selective Mn-doping additionally enhance inherent locality ODMR technique. We present time-resolved studies single {(Cd,Mg)Te/(Cd,Mn)Te} quantum wells (QWs) with manganese ions located at different positions along growth axis -- in center or on sides well. observe that spin-lattice Mn$^{2+}$ significantly...