S. A. Tarasenko's research while affiliated with Ioffe Physical Technical Institute and other places
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Publications (185)
We develop a microscopic theory of the fine structure of Dirac states in $(0lh)$-grown HgTe/CdHgTe quantum wells (QWs), where $l$ and $h$ are the Miller indices. It is shown that bulk, interface, and structure inversion asymmetry causes the anticrossing of levels even at zero in-plane wave vector and lifts the Dirac state degeneracy. In the QWs of...
We show that driving a two-dimensional electron gas by an in-plane electric field oscillating at the frequency $\omega$ gives rise to an electric current at $2\omega$ flowing near the edge of the system. This current has both parallel and perpendicular to the edge components, which emit electromagnetic waves at $2\omega$ with different polarization...
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 excited-state fine structure is inverted, compared to 4H-SiC. From the angular polarization dependencies of the emission, we reconstruct the s...
Spin-orbit interaction in semiconductor structures with broken space inversion symmetry leads to spin splitting of electron and hole states even in the absence of magnetic field. We discover that, beyond the Rashba and Dresselhaus contributions, there is an additional type of the zero-field spin splitting which is caused by the interplay of the cub...
Optically controllable solid-state spin qubits are one of the basic building blocks for applied quantum technology. Efficient extraction of emitted photons and a robust spin-photon interface are crucial for the realization of quantum sensing protocols and essential for the implementation of quantum repeaters. Though silicon carbide (SiC) is a very...
We show that the interband absorption of radiation in a two-dimensional (2D) Dirac material leads to a direct electric current flowing at sample edges. The photocurrent originates from the momentum alignment of electrons and holes and is controlled by the radiation polarization. We develop a microscopic theory of such an edge photogalvanic effect a...
The drift of electron spin helices in an external in-plane electric field in GaAs quantum wells is studied by means of time-resolved magneto-optical Kerr microscopy. The evolution of the spin distribution measured for different excitation powers reveals that, for short delay times and higher excitation powers, the spin helix drift slows down while...
Driving a 2D electron gas by AC electric field leads to a DC electric current flowing along the edge of the system. The effect is caused by the local breaking of space inversion symmetry at the edge. The current is generated in a narrow stripe determined by the screening length of the AC electric field and the mean free path of carriers. The develo...
We show that the inter-band absorption of radiation in a 2D Dirac material leads to a direct electric current flowing at sample edges. The photocurrent originates from the momentum alignment of electrons and holes and is controlled by the radiation polarization. We develop a microscopic theory of such an edge photogalvanic effect and calculate the...
We report on the observation of edge electric currents excited in bilayer graphene by terahertz laser radiation. We show that the current generation belongs to the class of second order in electric field phenomena and is controlled by the orientation of the THz electric field polarization plane. Additionally, applying a small magnetic field normal...
We report on the observation of edge electric currents excited in bi-layer graphene by terahertz laser radiation. We show that the current generation belongs to the class of second order in electric field phenomena and is controlled by the orientation of the THz electric field polarization plane. Additionally, applying a small magnetic field normal...
We report on the observation of symmetry breaking and the circular photogalvanic effect in CdxHg1−xTe alloys. We demonstrate that irradiation of bulk epitaxial films with circularly polarized terahertz radiation leads to the circular photogalvanic effect (CPGE) yielding a photocurrent whose direction reverses upon switching the photon helicity. Thi...
We develop a microscopic theory of spin noise in solid-state systems at electron paramagnetic resonance, when the spin dynamics is driven by static and radio-frequency (rf) magnetic fields and the stochastic effective magnetic field stemming from the interaction with environment. The rf field splits the peaks in the power spectrum of spin noise int...
We present studies of the cyclotron resonance (CR) in thick Cd$_x$Hg$_{1-x}$Te films with different cadmium concentrations corresponding to inverted and normal band order, as well as to an almost linear energy dispersion. Our results demonstrate that formation of two-dimensional topological surface states requires sharp interfaces between layers wi...
It is shown that the dissipation of energy in an electron gas confined in a quantum well made of non-centrosymmetric crystal leads to a direct electric current. The current originates from the real-space shift of the wave packets of Bloch electrons at the electron scattering by phonons, which tends to restore thermal equilibrium between the electro...
We report on the observation of symmetry breaking and the circular photogalvanic effect in Cd$_x$Hg$_{1-x}$Te alloys. We demonstrate that irradiation of bulk epitaxial films with circularly polarized terahertz radiation leads to the circular photogalvanic effect (CPGE) yielding a photocurrent whose direction reverses upon switching the photon helic...
We develop a microscopic theory of spin noise in solid-state systems at electron paramagnetic resonance, when the spin dynamics is driven by static and radio-frequency (RF) magnetic fields and the stochastic effective magnetic field stemming from the interaction with environment. The RF field splits the peaks in the power spectrum of spin noise int...
It is shown that the dissipation of energy in an electron gas confined in a quantum well made of non-centrosymmetric crystal leads to a direct electric current. The current originates from the real-space shift of the wavepackets of Bloch electrons at the electron scattering by phonons, which tends to restore thermal equilibrium between the electron...
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 present room-temperature coherent control of high-dimensional quantum bits, the so-called qudits, associated with vacancy-related spins in silicon...
Excitation of a topological insulator by a high‐frequency electric field of a laser radiation leads to a dc electric current in the helical edge channel whose direction and magnitude are sensitive to the radiation polarization and depend on the physical properties of the edge. An overview of theoretical and experimental studies of such edge photoel...
Excitation of a topological insulator by a high-frequency electric field of a laser radiation leads to a dc electric current in the helical edge channel whose direction and magnitude are sensitive to the radiation polarization and depend on the physical properties of the edge. We present an overview of theoretical and experimental studies of such e...
We develop a theory of electron-photon interaction for helical edge channels in two-dimensional topological insulators based on zinc-blende-type quantum wells. It is shown that the lack of space inversion symmetry in such structures enables the electro-dipole optical transitions between the spin branches of the topological edge states. Further, we...
We observe that the illumination of unbiased graphene in the quantum Hall regime with polarized terahertz laser radiation results in a direct edge current. This photocurrent is caused by an imbalance of persistent edge currents, which are driven out of thermal equilibrium by indirect transitions within the chiral edge channel. The direction of the...
We describe the trembling motion of conduction-band electrons in solids. The effect originates from the fact that, in the presence of the Rashba/Dresselhaus spin-orbit coupling and the Zeeman splitting, the electron velocity is not a conserved quantity and contains a contribution oscillating at the frequency determined by the spin gap. The phenomen...
Quantum bit or qubit is a two-level system, which builds the foundation for quantum computation, simulation, communication and sensing. Quantum states of higher dimension, i.e., qutrits (D = 3) and especially qudits (D = 4 or higher), offer significant advantages. Particularly, they can provide noise-resistant quantum cryptography, simplify quantum...
We observe that the illumination of unbiased graphene in the quantum Hall regime with polarized terahertz laser radiation results in a direct edge current. This photocurrent is caused by an imbalance of persistent edge currents, which are driven out of thermal equilibrium by indirect transitions within the chiral edge channel. The direction of the...
We develop a theory of electron-photon interaction for helical edge channels in two-dimensional topological insulators based on zinc-blende-type quantum wells. It is shown that the lack of space inversion symmetry in such structures enables the electro-dipole optical transitions between the spin branches of the topological edge states. Further, we...
Time-resolved Kerr-rotation microscopy explores the influence of optical doping on the persistent spin helix in a [001]-grown CdTe quantum well at cryogenic temperatures. Electron spin diffusion dynamics reveal a momentum-dependent effective magnetic field providing SU(2) spin-rotation symmetry, consistent with kinetic theory. The Dresselhaus and R...
Atomic-scale defects in silicon carbide, a widely used material in semiconductor industry, reveal high potential for quantum technologies. Spin-3/2 color centers associated with silicon vacancies are of particular interest for fundamental research and applications in sensorics and spintronics. Such centers are characterized by spin-dependent optica...
We show that the stacks of two-dimensional semiconductor crystals with the chiral packing exhibit optical activity and circular dichroism. We develop a microscopic theory of these phenomena in the spectral range of exciton transitions which takes into account the spin-dependent hopping of excitons between the layers in the stack and the interlayer...
We observe a dc electric current in response to terahertz radiation in lateral inter-digitated double-comb graphene p-n junctions. The junctions were fabricated by selective ultraviolet irradiation inducing p-type doping in intrinsic n-type epitaxial monolayer graphene. The photocurrent exhibits a strong polarization dependence and is explained by...
Spatio-temporal evolution of electron spins in a modulation-doped GaAs single quantum well is investigated using ultrafast two-color Kerr rotation spectroscopy. The evolution is governed by the spin-orbit interaction related to bulk and structural inversion asymmetries which manifests as an effective magnetic field. We directly extract the Dresselh...
We discuss the fine structure and spin dynamics of spin-3/2 centers associated with silicon vacancies in silicon carbide. The centers have optically addressable spin states which makes them highly promising for quantum technologies. The fine structure of the spin centers turns out to be highly sensitive to mechanical pressure, external magnetic and...
We study optical forces acting upon semiconductor quantum dots and the force driven motion of the dots in a colloid. In the spectral range of exciton transitions in quantum dots, both the gradient and the scattering contributions to the optical force resonantly increase. We reveal that the optical grating of the colloid leads to the formation of a...
We report on the observation of a circular photogalvanic current excited by terahertz (THz) laser radiation in helical edge channels of HgTe-based 2D topological insulators (TIs). The direction of the photocurrent reverses by switching the radiation polarization from right-handed to left-handed one and, for fixed photon helicity, is opposite for th...
Zitterbewegung is a striking consequence of relativistic quantum mechanics which predicts that free Dirac electrons exhibit a rapid trembling motion even in the absence of external forces. The trembling motion of an electron results from the interference between the positive and the negative-energy solutions of the Dirac equation, separated by one...
We show that for lattice-mismatched zinc-blende-type (110)-grown quantum wells a significant contribution to the zero-magnetic-field spin splitting of electron subbands comes from strain-induced spin-orbit coupling. Combining envelope function theory and atomistic tight-binding approach we calculate spin-orbit splitting constants for realistic quan...
We report on the observation of photogalvanic effects induced by terahertz radiation in type-II GaSb/InAs quantum wells with inverted band order. Photocurrents are excited at oblique incidence of radiation and consists of several contributions varying differently with the change of the radiation polarization state; the one driven by the helicity an...
We uncover the fine structure of a silicon vacancy in isotopically purified
silicon carbide (4H-$^{28}$SiC) and find extra terms in the spin Hamiltonian,
originated from the trigonal pyramidal symmetry of this spin-3/2 color center.
These terms give rise to additional spin transitions, which are otherwise
forbidden, and lead to a level anticrossing...
The study of electron transport and scattering processes limiting electron mobility in high-quality semiconductor structures is central to solid-state electronics. Here, we uncover an unavoidable source of electron scattering which is caused by fluctuations of nuclear spins. We calculate the momentum relaxation time of electrons in quantum wells go...
We show that a significant contribution to the spin-orbit splitting of electron subbands in (110)-grown quantum wells (QWs) comes from the strain-related splitting of the bulk conduction band which emerges due to a lattice mismatch between the QW and buffer layer crystals. We use the atomistic tight-binding approach to calculate the spin splitting...
We present a theory of the electron structure and the Zeeman effect for the
helical edge states emerging in two-dimensional topological insulators based on
HgTe/HgCdTe quantum wells with strong natural interface inversion asymmetry.
The interface inversion asymmetry, reflecting the real atomistic structure of
the quantum well, drastically modifies...
The driving of charge carriers confined in a quantum well lacking the center
of space inversion by an alternating electric field leads to the formation of a
direct electric current. We develop a microscopic theory of such a quantum
ratchet effect for quantum wells subjected to a static magnetic field. We show
that the ratchet current emerges for a...
The study of electron transport and scattering processes limiting electron
mobility in high-quality semiconductor structures is central to solid-state
electronics. Here, we uncover an unavoidable source of electron scattering
which is caused by fluctuations of nuclear spins. We calculate the momentum
relaxation time of electrons in quantum wells go...
We study the polarization optical properties of microcavities with embedded
(110)-oriented quantum wells. The spin dynamics of exciton polaritons in such
structures is governed by the interplay of the spin-orbit splitting of exciton
states, which is odd in the in-plane momentum, and the longitudinal-transverse
splitting of cavity modes, which is ev...
We develop a theory of thermal fluctuations of spin density emerging in a
two-dimensional electron gas. The spin fluctuations probed at spatially
separated spots of the sample are correlated due to Brownian motion of
electrons and spin-obit coupling. We calculate the spatiotemporal correlation
functions of the spin density for both ballistic and di...
We report on the observation of cyclotron resonance induced photocurrents,
excited by continuous wave terahertz radiation, in a 3D topological insulator
(TI) based on an 80 nm strained HgTe film. The analysis of the photocurrent
formation is supported by complimentary measurements of magneto-transport and
radiation transmission. We demonstrate that...
We report on a magneto-photoluminescence (PL) study of Mn modulation-doped
InAs/InGaAs/InAlAs quantum wells. Two PL lines corresponding to the radiative
recombination of photoelectrons with free and bound-on-Mn holes have been
observed. In the presence of a magnetic field applied in the Faraday geometry
both lines split into two circularly polarize...
The valley degeneracy of electron states in graphene stimulates intensive
research of valley-related optical and transport phenomena. While many
proposals on how to manipulate valley states have been put forward,
experimental access to the valley polarization in graphene is still a
challenge. Here, we develop a theory of the second optical harmonic...
The high-frequency (ac) conductivity of a high quality modulation doped
GeSi/Ge/GeSi single quantum well structure with hole density
$p$=6$\times$10$^{11}$cm$^{-2}$ was measured by the surface acoustic wave (SAW)
technique at frequencies of 30 and 85~MHz and magnetic fields $B$ of up to 18 T
in the temperature range of 0.3 -- 5.8 K. The acoustic ef...
We describe the fine structure of Dirac states in HgTe/CdHgTe quantum wells
of critical and close-to-critical thickness and demonstrate the formation of an
anticrossing gap between the tips of the Dirac cones driven by interface
inversion asymmetry. By combining symmetry analysis, atomistic calculations,
and k-p theory with interface terms, we obta...
The contactless surface acoustic wave technique is implemented to probe the high-frequency conductivity of a high-mobility p-Ge/GeSi quantum well structure in the regime of integer quantum Hall effect (IQHE) at temperatures 0.3-5.8 K and magnetic fields up to 18 T. It is shown that, in the IQHE regime at the minima of conductivity, holes are locali...
We study the orbital and spin dynamics of charge carriers induced by
non-overlapping linearly polarized light pulses in semiconductor quantum wells
(QWs). It is shown that such an optical excitation with coherent pulses leads
to a spin orientation of photocarriers and an electric current. The effects are
caused by the interference of optical transi...
We study the electron spin relaxation in both symmetric and asymmetric
GaAs/AlGaAs quantum wells (QWs) grown on (110) substrates in an external
magnetic field B applied along the QW normal. The spin polarization is induced
by circularly polarized light and detected by time-resolved Kerr rotation
technique. In the asymmetric structure, where a {\del...
Photoluminescence (PL) and highly circularly-polarized magneto-PL (up to 50%
at 6 T) from two-step bandgap InAs/InGaAs/InAlAs quantum wells (QWs) are
studied. Bright PL is observed up to room temperature, indicating a high
quantum efficiency of the radiative recombination in these QW. The sign of the
circular polarization indicates that it stems fr...
We study the tunneling of conduction electrons through a (110)-oriented
single-barrier heterostructure grown from III-V semiconductor compounds. It is
shown that, due to low spatial symmetry of such a barrier, the tunneling
current through the barrier leads to an electron spin polarization. The inverse
effect, generation of a direct tunneling curre...
We report on the observation of magnetic quantum ratchet effect in
metal-oxide-semiconductor field-effect-transistors on silicon surface
(Si-MOSFETs). We show that the excitation of an unbiased transistor by ac
electric field of terahertz radiation at normal incidence leads to a direct
electric current between the source and drain contacts if the t...
We show that the optical excitation of multi-valley systems leads to valley currents which depend on the light polarization. The net electric current, determined by the vector sum of single-valley contributions, vanishes for some peculiar distributions of carriers in the valley and momentum spaces forming a pure valley current. We report on the stu...
We present the theory of fine structure of electron states in symmetric and asymmetric zinc-blende-type quantum wells with the (110) crystallographic orientation. By combining the symmetry analysis,
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3
d
5
s* tight-binding method, and envelope-function approach we obtain quantitative description of in-plane wave vector, well width and applied el...
We report on the observation of the cyclotron-resonance-assisted photon drag
effect. Resonant photocurrent is detected in InSb/InAlSb quantum wells
structures subjected to a static magnetic field and excited by terahertz
radiation at oblique incidence. The developed theory based on Boltzmann's
kinetic equation is in a good agreement with the experi...
We study the optically induced spin polarization, spin dephasing and
diffusion in several high-mobility two-dimensional electron systems, which are
embedded in GaAs quantum wells grown on (110)-oriented substrates. The
experimental techniques comprise a two-beam magneto-optical spectroscopy system
and polarization-resolved photoluminescence. Under...
We report on the observation of the giant photocurrent in HgTe/HgCdTe quantum wells (QW) of critical thickness at which a Dirac spectrum emerges1,2. Exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping the magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (-0.4...
We report on the observation of the giant photocurrents in HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum emerges. At an exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (−0.4 T...
We develop the microscopic theory of electron spin dephasing in (110)-grown
quantum wells where the electron scattering time is comparable to or exceeds
the period of spin precession in the effective magnetic field caused by
spin-orbit coupling. Structures with homogeneous and fluctuating Rashba field,
which triggers the dephasing of electron spins...
A periodically driven system with spatial asymmetry can exhibit a directed motion facilitated by thermal or quantum fluctuations. This so-called ratchet effect has fascinating ramifications in engineering and natural sciences. Graphene is nominally a symmetric system. Driven by a periodic electric field, no directed electric current should flow. Ho...
We report on the observation of the giant spin-polarized photocurrent in
HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum
emerges. Exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping
magnetic field we detected a resonant photocurrent. Remarkably, the position of
the resonance can be tuned from negative...
We report on the observation of terahertz radiation induced photocurrents in single-layer graphene samples subjected to an in-plane magnetic field. The photosignal is observed for both, linearly and circularly polarized radiation. A remarkable effect is that the current inverts its sign not only by switching the magnetic field direction, but as wel...