T. Wójtowicz
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View article: Low-energy excitations in multiple modulation-doped CdTe/(CdMg)Te quantum wells
Low-energy excitations in multiple modulation-doped CdTe/(CdMg)Te quantum wells Open
Low energy excitations of a two-dimensional electron gas (2DEG) in modulation-doped multiple (ten) quantum wells (QWs) was studied using far-infrared magneto-transmission technique at liquid helium temperatures. A large distance between ne…
View article: Topological phase diagram and quantum magnetotransport effects in (Pb,Sn)Se quantum wells with magnetic barriers (Pb,Eu)Se
Topological phase diagram and quantum magnetotransport effects in (Pb,Sn)Se quantum wells with magnetic barriers (Pb,Eu)Se Open
In this study, we report here on a successful growth by molecular beam epitaxy of high crystalline quality Pb$_{1-x}$Sn$_{x}$Se:Bi/Pb$_{1-y}$Eu$_{y}$Se QWs with $x = 0.25$ and $y = 0.1$, and on their magnetotransport characterization as a …
View article: Temperature and electron concentration dependences of 1/<i>f</i> noise in Hg<sub>1−<i>x</i></sub>Cd<sub><i>x</i></sub>Te – evidence for a mobility fluctuations mechanism
Temperature and electron concentration dependences of 1/<i>f</i> noise in Hg<sub>1−<i>x</i></sub>Cd<sub><i>x</i></sub>Te – evidence for a mobility fluctuations mechanism Open
Temperature and gate voltage dependences of the 1/ f noise in Hg 1− x Cd x Te and HgTe QW provide a strong argument for mobility fluctuations ( δμ ) as the dominant noise mechanism.
View article: Temperature and Electron Concentration Dependences of 1/f Noise in Hg$_{1-x}$Cd$_x$Te -- Evidence for a Mobility Fluctuations Mechanism
Temperature and Electron Concentration Dependences of 1/f Noise in Hg$_{1-x}$Cd$_x$Te -- Evidence for a Mobility Fluctuations Mechanism Open
Hg$_{1-x}$Cd$_x$Te is a unique material with the band-gap tunable by the temperature, pressure, and cadmium content in a wide range, from 1.6 eV to inverted band-gap of -0.3 eV. This makes Hg$_{1-x}$Cd$_x$Te one of the key materials for in…
View article: PbTe/SnTe heterostructures -- candidate platform for studying spin-triplet superconductivity
PbTe/SnTe heterostructures -- candidate platform for studying spin-triplet superconductivity Open
This paper explores the potential for spin-triplet superconductivity in molecular beam epitaxy grown PbTe/SnTe semiconductor heterostructures. We present convincing evidence for spin-triplet pairing by soft point-contact spectroscopy exper…
View article: 3D topological semimetal phases of strained <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si72.svg"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>-Sn on insulating substrate
3D topological semimetal phases of strained -Sn on insulating substrate Open
View article: Magnetospectroscopy of shallow donors in two dimensions in the presence of fluctuations of the electrostatic potential
Magnetospectroscopy of shallow donors in two dimensions in the presence of fluctuations of the electrostatic potential Open
Spectroscopy of shallow donors is a tool to test theoretical models and to reveal properties of semiconductors. In this work we consider intra-shallow impurity transitions by studying a CdTe/(Cd, Mg)Te structure grown by a molecular beam e…
View article: 3D Topological Semimetal Phases of Strainedα-Sn on Insulating Substrate
3D Topological Semimetal Phases of Strainedα-Sn on Insulating Substrate Open
View article: Nanohardness and Young’s Modulus of Pb<sub>1–<i>x</i></sub>Cd<sub><i>x</i></sub>Te Crystals Grown by the SSVG and MBE Methods
Nanohardness and Young’s Modulus of Pb<sub>1–<i>x</i></sub>Cd<sub><i>x</i></sub>Te Crystals Grown by the SSVG and MBE Methods Open
The nanohardness and Young's modulus of Pb1-xCdxTe single crystals prepared by the self-selecting vapor growth (SSVG) method and thick, MBE-grown layers with a total Cd content of up to 7% metal atoms we…
View article: Microwave-synthesized CZTS nanoparticles and their surface modification for the model hybrid photovoltaic devices
Microwave-synthesized CZTS nanoparticles and their surface modification for the model hybrid photovoltaic devices Open
View article: Magnetophotoluminescence of Modulation-Doped CdTe Multiple Quantum Wells
Magnetophotoluminescence of Modulation-Doped CdTe Multiple Quantum Wells Open
Modulation-doped CdTe quantum wells (QWs) with Cd0.7Mg0.3Te barriers were studied by photoluminescence (PL) and far-infrared Fourier spectroscopy under a magnetic field at 4.2 K and by Raman spectroscopy at room tempe…
View article: 3D Topological Semimetal Phases of Strained $α$-Sn on Insulating Substrate
3D Topological Semimetal Phases of Strained $α$-Sn on Insulating Substrate Open
$α$-Sn is an elemental topological material, whose topological phases can be tuned by strain and magnetic field. Such tunability offers a substantial potential for topological electronics. However, InSb substrates, commonly used to stabili…
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: Compact terahertz devices based on silicon in CMOS and BiCMOS technologies
Compact terahertz devices based on silicon in CMOS and BiCMOS technologies Open
This paper reports on compact CMOS-based electronic sources and detectors developed for the terahertz frequency range. It was demonstrated that with the achievable noise-equivalent power levels in a few tens of pW\Hz 1/2 and the emitted po…
View article: Magnetospectroscopy of CdTe/Cd 1-xMg xTe modulation-doped quantum wells in THz and visible range
Magnetospectroscopy of CdTe/Cd 1-xMg xTe modulation-doped quantum wells in THz and visible range Open
Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd 1-xMg xTe quantum well. THz experiments were performed at liquid helium t…
View article: Terahertz response of CdTe/Cd 1-xMg xTe modulation-doped multiple quantum wells
Terahertz response of CdTe/Cd 1-xMg xTe modulation-doped multiple quantum wells Open
Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd 1-xMg xTe multiple quantum wells. The measurements were carried out as a function of…
View article: Carrier separation in type II quantum dots inserted in (Zn,Mg)Te/ZnSe nanowire
Carrier separation in type II quantum dots inserted in (Zn,Mg)Te/ZnSe nanowire Open
Quantum dots consisting of an axial Zn0.97Mg0.03Te insertion inside a large bandgap Zn0.9Mg0.1Te nanowire cores are fabricated in a molecular beam epitaxy system by employing the vapor-liquid-solid growth mechanism. Additionally, this stru…
View article: Spin-polarization of topological crystalline and normal insulator Pb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si25.svg" display="inline" id="d1e471"><mml:msub><mml:mrow/><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Sn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si26.svg" display="inline" id="d1e483"><mml:msub><mml:mrow/><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Se (111) epilayers probed by photoelectron spectroscopy
Spin-polarization of topological crystalline and normal insulator PbSnSe (111) epilayers probed by photoelectron spectroscopy Open
View article: Trion magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells
Trion magnetic polarons in (Cd,Mn)Te/(Cd,Mn,Mg)Te quantum wells Open
A trion magnetic polaron formed by the exchange interaction of a positively charged exciton (trion) with localized spins of Mn$^{2+}$ ions is found experimentally in a 4\,nm wide Cd$_{0.98}$Mn$_{0.02}$Te/Cd$_{0.78}$Mn$_{0.02}$Mg$_{0.2}$Te …
View article: Reliability Analysis of MV Electric Distribution Networks Including Distributed Generation and ICT Infrastructure
Reliability Analysis of MV Electric Distribution Networks Including Distributed Generation and ICT Infrastructure Open
In recent years, the increased distributed generation (DG) capacity in electric distribution systems has been observed. Therefore, it is necessary to research existing structures of distribution networks as well as to develop new (future) …
View article: Transverse magnetic routing of light emission in hybrid plasmonic-semiconductor nanostructures: Towards operation at room temperature
Transverse magnetic routing of light emission in hybrid plasmonic-semiconductor nanostructures: Towards operation at room temperature Open
We study experimentally and theoretically the temperature dependence of\ntransverse magnetic routing of light emission from hybrid\nplasmonic-semiconductor quantum well structures where the exciton emission from\nthe quantum well is routed…
View article: Unit cell distortion and surface morphology diversification in a SnTe/CdTe(001) topological crystalline insulator heterostructure: influence of defect azimuthal distribution
Unit cell distortion and surface morphology diversification in a SnTe/CdTe(001) topological crystalline insulator heterostructure: influence of defect azimuthal distribution Open
Monoclinic-distorted SnTe(001) topological crystalline insulator layers with a strain large enough to open the energy gap in the metallic Dirac-like spectrum of surface states were grown by molecular beam epitaxy and crystallographically a…
View article: Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties
Oxidation of MBE-Grown ZnTe and ZnTe/Zn Nanowires and Their Structural Properties Open
Results of comparative structural characterization of bare and Zn-covered ZnTe nanowires (NWs) before and after thermal oxidation at 300 °C are presented. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution …
View article: Near-infrared emission from spatially indirect excitons in type II ZnTe/CdSe/(Zn,Mg)Te core/double-shell nanowires
Near-infrared emission from spatially indirect excitons in type II ZnTe/CdSe/(Zn,Mg)Te core/double-shell nanowires Open
ZnTe/CdSe/(Zn, Mg)Te core/double-shell nanowires are grown by molecular beam epitaxy by employing the vapor–liquid–solid growth mechanism assisted with gold catalysts. A photoluminescence study of these structures reveals the presence of a…
View article: Signatures of dephasing by mirror-symmetry breaking in weak-antilocalization magnetoresistance across the topological transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Pb</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sn</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Se</mml:mi></mml:math>
Signatures of dephasing by mirror-symmetry breaking in weak-antilocalization magnetoresistance across the topological transition in Open
Many conductors, including recently studied Dirac materials, show saturation\nof coherence length on decreasing temperature. This surprising phenomenon is\nassigned to external noise, residual magnetic impurities or two-level systems\nspec…
View article: Magnetic field dependence of the in-plane hole <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>g</mml:mi></mml:math> factor in ZnSe- and CdTe-based quantum wells
Magnetic field dependence of the in-plane hole factor in ZnSe- and CdTe-based quantum wells Open
The effective $g$ factor of holes is measured in modulation-doped ZnSe/(Zn,Mg)(S,Se) quantum wells and from surface-state $p$-doped CdTe/(Cd,Mg)Te quantum wells by time-resolved pump-probe Kerr rotation. The measurements are performed at a…
View article: Plasmon-to-exciton spin conversion in semiconductor-metal hybrid nanostructures
Plasmon-to-exciton spin conversion in semiconductor-metal hybrid nanostructures Open
Optical control of electronic spins is the basis for ultrafast spintronics:\ncircularly polarized light in combination with spin-orbit coupling of the\nelectronic states allows for spin manipulation in condensed matter. However,\nthe conve…
View article: High-resolution resonance spin-flip Raman spectroscopy of pairs of manganese ions in a CdTe quantum well
High-resolution resonance spin-flip Raman spectroscopy of pairs of manganese ions in a CdTe quantum well Open
We report the observation of tens of minor lines of the combinational\nspin-flip Raman scattering in a CdTe:Mn quantum well by means of the\nhigh-resolution optical spectroscopy. Classification of this manifold leads to\nfour characteristi…
View article: Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications
Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells as Terahertz Detectors for High Magnetic Field Applications Open
The cyclotron and magnetoplasmon resonances were studied at 2 K in grating metamaterials fabricated on wafers with one or two modulation doped CdTe/CdMgTe quantum wells. The gratings (with the period varied between 2 μ m and 8 μ m) were pr…
View article: Polarization of Magnetoplasmons in Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells
Polarization of Magnetoplasmons in Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells Open
Grating metamaterials were fabricated with electron beam lithography on CdTe/CdMgTe modulation doped structures with two non-interacting quantum wells. Two types of samples were studied: with etched gratings and with gratings formed by dep…