M. V. Éntin
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View article: Interplay between electron-hole and impurity scattering in HgTe-based quantum wells
Interplay between electron-hole and impurity scattering in HgTe-based quantum wells Open
A 20-nm-wide (100)-oriented HgTe quantum well (QW) hosts a two-dimensional (2D) semimetal comprising both electrons and holes. In this study, we report that in addition to the previously observed quadratic temperature dependence of resista…
View article: Resistivity of Non-Galilean-Invariant Two-Dimensional Dirac Systems
Resistivity of Non-Galilean-Invariant Two-Dimensional Dirac Systems Open
We revisited the influence of electron-electron scattering on the resistivity of a two-dimensional system with a linear spectrum. In conventional systems with a parabolic spectrum, where umklapp scattering is either prohibited or ineffecti…
View article: Microwave Photoconductivity of Gapless Dirac Fermions in HgTe Quantum Wells
Microwave Photoconductivity of Gapless Dirac Fermions in HgTe Quantum Wells Open
The microwave photoconductivity of a system of gapless Dirac fermions in HgTe quantum wells with a critical thickness has been experimentally and theoretically investigated. It has been found that the photoconductivity fluctuates depending…
View article: Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes
Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes Open
The resistivity of two-dimensional (2D) metals generally exhibits insensitivity to electron-electron scattering. However, it is worth noting that Galilean invariance may not hold true in systems characterized by a spectrum containing multi…
View article: Electron-hole scattering-induced temperature behaviour of HgTe-based semimetal quantum well
Electron-hole scattering-induced temperature behaviour of HgTe-based semimetal quantum well Open
The semimetal quantum well (QW) based on HgTe structures exhibiting unusual transport properties at low temperature is examined experimentally. It demonstrates either a linear or quadratic growth of resistance with temperature at different…
View article: Interaction-dominated transport in two-dimensional conductors: From degenerate to partially degenerate regime
Interaction-dominated transport in two-dimensional conductors: From degenerate to partially degenerate regime Open
In this study, we investigate the conductivity of a two-dimensional (2D)\nsystem in HgTe quantum well comprising two types of carriers with linear and\nquadratic spectra, respectively. The interactions between the two-dimensional\nDirac ho…
View article: Mesoscopic Conductance Fluctuations in 2D HgTe Semimetal
Mesoscopic Conductance Fluctuations in 2D HgTe Semimetal Open
Mesoscopic conductance fluctuations were discovered in a weak localization regime of a strongly disordered two-dimensional HgTe-based semimetal. These fluctuations exist in macroscopic samples with characteristic sizes of 100 μm and exhibi…
View article: Theory of electron states in two-dimensional Wigner clusters
Theory of electron states in two-dimensional Wigner clusters Open
The results of modeling a finite system of interacting two-dimensional electrons placed at zero temperature into an external parabolic potential well are presented. The structure of the 2D Wigner cluster is found. The distribution function…
View article: Transport through the network of topological channels in HgTe based quantum well
Transport through the network of topological channels in HgTe based quantum well Open
Topological insulators (TIs) represent a new quantum state of matter which is characterized by edge or surface states and an insulating band gap in the bulk. In a two-dimensional (2D) system based on the HgTe quantum well (QW) of critical …
View article: Nonlinear circular valley photogalvanic effect
Nonlinear circular valley photogalvanic effect Open
We develop a theory of circular photogalvanic effect in non-gyrotropic two-dimensional transition metal dichalcogenide monolayers under interband optical transitions. Oblique incidence of circularly-polarized electromagnetic field or norma…
View article: Theory of electron states in a twisted two-valley 2D system
Theory of electron states in a twisted two-valley 2D system Open
A system similar to gapped graphene (for example, fluorinated) containing two or more electron valleys is considered. It is assumed that the material has a sector cut and is deformed in the plane and the the cut edges are connected to form…
View article: Magnetoresistance of edge states of a two-dimensional topological insulator
Magnetoresistance of edge states of a two-dimensional topological insulator Open
The theory of magnetoresistance of the edge state of a two-dimensional topological insulator is developed. The magnetic field violates the time-reversal invariance. Magnetoresistance arises due to the energy gap opened by a magnetic field …
View article: Thermo emf in a two-dimensional electron-hole system in HgTe quantum wells in the presence of magnetic field. The role of the diffusive and the phonon-drag contributions
Thermo emf in a two-dimensional electron-hole system in HgTe quantum wells in the presence of magnetic field. The role of the diffusive and the phonon-drag contributions Open
We present an experimental study of the thermo emf of a two-dimensional electron-hole system in a 21 nm HgTe quantum well in the presence of magnetic field. The first experimental observation of Nernst-Ettingshausen effect in a 2D semimeta…
View article: Conductivity of 2D HgTe layer near the critical width. The role of developed edge states network and random mixture of p- and n-domains
Conductivity of 2D HgTe layer near the critical width. The role of developed edge states network and random mixture of p- and n-domains Open
The conductivity of 2D HgTe quantum well with a width $\sim 6.3$nm, close to the transition from ordinary to topological insulating phases, is studied. The Fermi level is supposed to get to the overall energy gap. The consideration is base…
View article: Scattering of Electrons between Edge and Two-Dimensional States of a Two-Dimensional Topological Insulator and the Conductivity of the Topological Insulator Strip in a Metallic State
Scattering of Electrons between Edge and Two-Dimensional States of a Two-Dimensional Topological Insulator and the Conductivity of the Topological Insulator Strip in a Metallic State Open
The lifetime of electrons on edge states of a two-dimensional topological\ninsulator against the background of an allowed two-dimensional band has been\ndetermined. It has been shown that this time in the case of scattering on\nCoulomb imp…
View article: Thermopower of a Two-Dimensional Semimetal in a HgTe Quantum Well
Thermopower of a Two-Dimensional Semimetal in a HgTe Quantum Well Open
The thermopower in a two-dimensional semimetal existing in HgTe quantum wells\n18-21 nm thick has been studied experimentally and theoretically for the first\ntime. It has been found theoretically and experimentally that the thermopower\nh…
View article: Is the edge states energy spectrum of a 2D topological insulator linear?
Is the edge states energy spectrum of a 2D topological insulator linear? Open
The linearity of the edge states spectrum in a 2D topological insulator, important for various transport phenomena, is studied. Different edge state models are examined. It is found that, in some of them, the linearity is perfect, while, i…
View article: Edge capacitance of a two-dimensional topological insulator
Edge capacitance of a two-dimensional topological insulator Open
We study capacitance of the 2D topological insulator (TI) edge states. The total capacitance is combined as a serial circuite of 3 capacitors presenting geometrical $C_G$, quantum $C_Q$ and correlation $C_{corr}$ contributions to the elect…