Спин-зависимое туннелирование в двойной квантовой точке в режиме "медленной" эволюции

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Спин-зависимое туннелирование в двойной квантовой точке в режиме "медленной" эволюции

Физика и техника полупроводников. 2022. Т. 56. № 10. С. 973–978.

Denis K., Запруднов Н. А.

Research target: Physics Nanotechnologies

Language: Russian

DOI

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From frozen Coulomb decoherence to thermalization: Classical and quantum density-matrix routes to Balescu–Lenard and Landau kinetics

Budkov Y., Annals of Physics 2026 Vol. 495 No. 3 Article 170796

We study the density-matrix kinetics of a charged test particle in two types of Coulomb environment. For a prescribed Gaussian potential, averaging the random-unitary dynamics leads to a Born–Novikov memory equation; Novikov’s identity is exact, but its closure requires a second-order approximation. An equilibrium quantum bath instead yields a Born–Redfield equation with ordered correlators and ...

Added: October 26, 2026

On non-Abelian waves repeatedly changing sign at constant phases

Alexander S. Rabinowitch, International Journal of Modern Physics A 2026 Vol. 41 No. 30 Article 2650168

In this paper, we study a new class of wave solutions to the SU(2) Yang-Mills equations in the region outside field sources. They represent a significant addition to the wave solutions obtained in our previous publications describing non-Abelian transverse progressive waves propagating in the direction of the Cartesian z-axis. In the new paper, wave solutions to the considered system ...

Added: October 26, 2026

Electrically driven Rabi dynamics of magnetic field induced corner states in a two-dimensional topological insulator

D.V. Khomitsky, Lavrukhina E. A., Krasavin D. P. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 22 Article 225414

We study coherent electric manipulation of magnetic field induced localized states at a double kink of a helical edge in a HgTe/CdHgTe quantum well. An in-plane magnetic field opens a gap in the one-dimensional (1D) edge spectrum, while changes in the edge orientation generate localized in-gap states at the kinks. We show that, for suitable ...

Added: October 23, 2026

Stress tensor in fundamental measure theory of hard-sphere fluids: A thermomechanical approach

Budkov Y., Kalikin N., Journal of Chemical Physics 2026 Vol. 165 No. 16 Article 164108

We derive the local pressure tensor generated by the original Rosenfeld fundamental measure theory (FMT) for hard-sphere fluids from an arbitrary infinitesimal deformation. The variation of a finite-distance FMT kernel is written via the line integrals of the local deformation gradient along the straight segment connecting its end points. The resulting symmetric pressure tensor consists ...

Added: October 22, 2026

Отсутствие отражения фонон-поляритона от края металлической маски на поверхности SiC

Ивченко В. С., Иевлева В. А., Matienko D. et al., Журнал технической физики 2026 № 9 С. 1738–1749

Задача о возбуждении бегущих фонон-поляритонных волн на поверхности полярного кристалла падающей извне световой волной (с частотой, близкой к частоте решеточных колебаний) решена теоретически только для бесконечной открытой поверхности кристалла. В случаях, когда часть поверхности покрыта металлической маской, препятствующей проникновению возбуждающего излучения к атомам среды, и эта маска имеет произвольную форму, общепризнанного решения неоднородной задачи нет. ...

Added: October 20, 2026

Исследование движения сферического фронта клеток в вязком матриксе: роль клеточных делений и взаимодействия клеток с матриксом при развитии опухолей

Logvenkov S. A., Известия РАН. Механика жидкости и газа 2026 № 3 С. 59–75

The problem of the evolution of cell volume fraction in a spherical aggregate composed of cells, extracellular matrix, and fluid is considered. The aggregate is surrounded by extracellular matrix. The problem formulation employs a multiphase model of a biological continuum, previously developed by the author, consisting of two actively interacting solid phases and a fluid. The propagation of ...

Added: October 20, 2026

Electrically driven Rabi dynamics of magnetic field induced corner states in a two-dimensional topological insulator

Lavrukhina E. A., Krasavin D. P., Krishtopenko S. S. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 22 Article 225414

Added: October 19, 2026

Phase Transitions in the Ni2.14Mn0.81Fe0.05Ga Heusler Alloy under the Influence of a Magnetic Fild and Hydrostatic Pressure

Смерчанский П. С., Koledov V. V., Kamantsev A. P. et al., Physics of Metals and Metallography 2026 Vol. 127 No. 6-7 P. 689–693

Heusler alloys of the Ni2MnX family, where X = Ga, In, Sn, …, which have been shown to exhibit giant magnetocaloric effect (MCE) and magnetically controlled shape memory effect due to thermoelastic magnetostructural phase transition (MSPT), continue to attract attention. However, these functional properties are fully manifested in strong magnetic fields of at least several T. Currently, ...

Added: October 19, 2026

Dissipative quantum mechanics of Andreev bound states

Zaikin A., Kalenkov M. S., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 Article 214502

We propose a microscopic scheme that allows to describe ac Josephson effect in superconducting junctions in terms of dissipative quantum dynamics of subgap Andreev bound states. This approach is particularly useful for highly transparent junctions at subgap bias voltages in which case a nontrivial combination of Landau-Zener tunneling between Andreev levels and their instability due to quasiparticle escape ...

Added: October 18, 2026

Landau-Zener Tunneling and Quantum Interference of Andreev States

Zaikin A., Kalenkov M. S., Physical Review Letters 2026 Vol. 137 Article 076004

With the aid of a microscopic theory we derive an effective Hamiltonian that controls quantum dynamics of Andreev states in superconducting nanojunctions out of equilibrium. Resolving the corresponding Schrödinger-like equation we obtain the “wave functions” for Andreev levels and evaluate electric current across the junction in the presence of an external voltage bias.We demonstrate that quantum interference of Andreev ...

Added: October 18, 2026

Structure and conformational dynamics of formamide molecule in the ground and lowest excited electronic states

Тукачев Н. В., Bataev V., Abramenkov A. et al., Computational and Theoretical Chemistry 2016 No. 1080 P. 23–32

Electronic state calculations, such as equilibrium geometry parameters, harmonic vibrational frequencies and potential barriers to conformational transitions (as well as conformer energy differences in excited states), using ab initio methods, such as MP2, CCSD(T), CASSCF, CASPT2 and MRCI, were carried out on the formamide molecule in the ground (S0) and the lowest excited singlet (S1) ...

Added: October 14, 2026

Conformational analysis of N-methylformamide in ground S0 and excited S1 and T1 electronic states

Тукачев Н. В., Bataev V. А., Godunov I. А., Journal of Quantitative Spectroscopy and Radiative Transfer 2016 Vol. 177 P. 291–300

For conformers of the N-methylformamide (HCONHCH3) molecule, calculations of equilibrium geometry parameters, harmonic vibration frequencies, energy differences and potential barriers to conformational transitions were performed in the ground (S0) and lowest excited singlet (S1) and triplet (T1) electronic states. In the S0 state, the molecule exists in trans and cis stable conformations (having Cs symmetry). ...

Added: October 14, 2026

Conformational analysis of acetamide in the ground and lowest excited electronic states

Тукачев Н. В., Bataev V. А., Godunov I. А., Journal of Quantitative Spectroscopy and Radiative Transfer 2017 Vol. 192 P. 30–41

For acetamide molecule (CH3CONH2) in the ground (S0) and lowest excited singlet (S1) and triplet (T1) electronic states calculations of equilibrium geometry parameters, harmonic vibrational frequencies and barriers to conformational transitions (also conformer energy differences in excited states) using following ab initio methods: MP2, CCSD(T), CASSCF, CASPT2 and MRCI were performed. One-, two- and three-dimensional ...

Added: October 14, 2026

Conformational analysis of N-methylacetamide molecule in the ground and excited electronic states

Тукачев Н. В., Bataev V. A., Godunov I. A., Computational and Theoretical Chemistry 2017 Vol. 1113 P. 82–93

Equilibrium geometry parameters, harmonic vibrational frequencies and barriers to conformational transitions and conformer energy differences for N-methylacetamide (CH3CONHCH3) molecule in S0, S1 and T1 electronic states were calculated in MP2 (S0) and CASPT2 (S1, T1) levels of theory. It is known that there are two planar (or effectively planar) conformers of N-methylacetamide in the ground ...

Added: October 14, 2026

Ground state geometry of PPV oligomers

Тукачев Н. В., Maslennikov D., Sosorev A. et al., The Journal of Physical Chemistry Letters 2019 Vol. 10 No. 12 P. 3232–3239

Conformational space of polyphenylenevinylene oligomers is systematically investigated computationally at energies relevant for room temperature dynamics in a solvent and in a solid state. Our calculations show that optimal oligomer structures are essentially planar. However, lack of a deep minimum at the planar geometry allows for large molecular deformations even at very low temperatures. At ...

Added: October 14, 2026

Effects of π-spacer and fluorine loading on the optoelectronic and photovoltaic properties of (X-DADAD)n benzodithiophene-based conjugated polymers

Тукачев Н. В., Akkuratov A., Kuznetsov I. et al., Synthetic Metals 2020 Vol. 259 Article 116231

Four new conjugated polymers based on benzodithiophene, thiophene and 2,1,3-benzothiadiazole or 5,6-difluoro-2,1,3-benzothiadiazole were synthesized and investigated as absorber materials for organic photovoltaics. The effect of (bi)thiophene π-spacers and fluorine substitution on the physicochemical and optoelectronic properties of the polymers was revealed and correlations were drawn with their electrical characteristics in organic solar cells. In particular, ...

Added: October 14, 2026

Toward probing of the local electron–phonon interaction in small-molecule organic semiconductors with Raman spectroscopy

Тукачев Н. В., Nuraliev M., Parashchuk O. et al., Journal of Chemical Physics 2020 Vol. 153 No. 17 Article 174303

Electron–phonon interaction strongly affects and often limits charge transport in organic semiconductors (OSs). However, approaches to its experimental probing are still in their infancy. In this study, we probe the local electron–phonon interaction (quantified by the charge-transfer reorganization energy) in small-molecule OSs by means of Raman spectroscopy. Applying density functional theory calculations to four series ...

Added: October 14, 2026

Impact of the acceptor units on optoelectronic and photovoltaic properties of (XDADAD)n-type copolymers:computational and experimental study

Тукачев Н. В., Klimovich I., Prudnov F. et al., Dyes and Pigments 2021 Vol. 185 Article 108899

A series of ten conjugated polymers incorporating in their molecular frameworks extended DADAD building blocks with thiophene donor (D) and either benzotriazole, benzoxadiazole, benzothiadiazole, difluorobenzothiadiazole or quinoxaline acceptor (A) units were synthesized and characterized. The optoelectronic properties of new polymers were computed and experimentally investigated revealing a good relationship, which can guide further rational design ...

Added: October 14, 2026

Формирование связанных состояний и управление их локализацией в двойной квантовой точке на крае двумерного топологического изолятора с магнитными барьерами

Denis K., Лаврухина Е. А., Тележников А. В., Физика и техника полупроводников 2023 Т. 57 № 7 С. 551–554

Разработана модель локализованных состояний в двойной квантовой точке на крае топологического изолятора на основе квантовой ямы HgTe/CdTe, сформированной тремя магнитными барьерами. Исследованы особенности энергетического спектра, плотности вероятности и спиновой плотности квантовых состояний в зависимости от ориентации векторов намагниченности магнитных барьеров. Изучена локализация волновых функций слева и справа от точки антикроссинга в спектре и сделан вывод ...

Added: September 6, 2026

Управление спиновой динамикой в двойной квантовой точке в условиях электрического дипольного спинового резонанса через перестраиваемое спин-орбитальное взаимодействие

Denis K., Запруднов Н. А., Физика и техника полупроводников 2024 Т. 58 № 4 С. 173–178

Рассматривается влияние соотношения вкладов Рашбы и Дрессельхауза в спин-орбитальном взаимодействии на траекторию спина на сфере Блоха, индуцируемую периодическим электрическим полем в двойной квантовой точке в полупроводнике GaAs, при условии электрического дипольного спинового резонанса. Показано, что изменение амплитуды параметра Рашбы, которое может быть осуществлено полем затвора, приводит к изменению плоскости вращения спина в широких пределах. Предсказанный ...

Added: September 6, 2026

Управление локализацией зарядовой и спиновой плотности в двойной квантовой точке на крае топологического изолятора как физическая основа операций с кубитами

Denis K., Лаврухина Е. А., Физика и техника полупроводников 2025 Т. 59 № 6 С. 344–349

Исследованы методы управления пространственной локализацией и спиновой поляризацией состояний в модели двойной квантовой точки на крае топологического изолятора на основе квантовой ямы HgTe/CdTe, сформированной тремя магнитными барьерами. Обнаружены переходы в спектре под действием резонансного электрического поля, для которых начальные и конечные состояния отвечают различной пространственной локализации либо определенному знаку выбранной спиновой проекции. На их основе ...

Added: September 6, 2026

Управление динамикой спина в двойной полупроводниковой квантовой точке с помощью бигармонического электрического поля

Denis K., Запруднов Н. А., Физика твердого тела 2026 Т. 68 № 4 С. 639–648

Рассматривается задача о динамике туннелирования и переворота спина электрона под действием бигармонического электрического поля, приложенного к двойной квантовой точке на основе арсенида галлия с сильным спин-орбитальным взаимодействием. При настройке частоты первой гармоники на зеемановское расщепление в одной точке и частоты второй гармоники на разность потенциальных энергий в соседних точках для определенных амплитуд гармоник наблюдаются два ...

Added: September 6, 2026

Probing the features of electron dispersion by tunneling between slightly twisted bilayer graphene sheets

Alexey A. Sokolik, Azat F. Aminov, Vdovin E. et al., Applied Physics Letters 2025 Vol. 127 No. 23 Article 233101

Tunneling conductance between two bilayer graphene (BLG) sheets separated by 2 nm-thick insulating barrier was measured in two devices with the twist angles between BLGs less than 1°. At small bias voltages, the tunneling occurs with conservation of energy and momentum at the points of intersection between two relatively shifted Fermi circles. Here, we experimentally ...

Added: October 21, 2025

Конструкции блокирующих слоев для подавления паразитной рекомбинации в мощных диодных лазерах с GaAs волноводом

Муретова М. Е., Ф.И. Зубов, Асрян Л. В. et al., Физика и техника полупроводников 2022 Т. 56 № 3 С. 363–369

Using numerical simulation, the search for designs of asymmetric barrier layers (ABLs) in a laser diode with a GaAs waveguide emitting at a wavelength of λ = 980 nm is carried out. A pair of ABLs adjoining the active region on both sides blocks undesired charge-carrier flows and suppresses parasitic spontaneous recombination in the waveguide layers. Optimal designs ...

Added: August 11, 2022