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Crucial effect of transverse vibrations on the transport through polymer chains
Journal of Chemical Physics. 2020. Vol. 153. No. 13. P. 134102.
Boulatov A., Burin A.
The low temperature transport of electron, or vibrational or electronic exciton towards polymer chains turns out to be dramatically sensitive to its interaction with transverse acoustic vibrations. We show that this interaction leads to substantial polaron effect and decoherence, which are generally stronger than those associated with longitudinal vibrations. For site-dependent interactions transverse phonons form subohmic bath leading to the quantum phase transition accompanied by full suppression of the transport at zero temperature and fast decoherence characterized by temperature dependent rate k2 ∝ T3/4 at low temperature while k2 ∝ T2 for site-independent interactions. The latter dependence was used to interpret recent measurements of temperature dependent vibrational energy transport in polyethylene glycol oligomers.
Khomitsky D.V., Bastrakova M. V., Pashin D. S., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 08 Article 085427
Coupled spin evolution and tunneling together with the relaxation and decoherence effects are studied for the double quantum dot formed in a semiconductor nanowire and driven by the periodic electric field. Such structure represents a model of the spin and charge subsystems interacting via the strong spin-orbit coupling. It is found that at certain regimes ...
Added: September 6, 2026
Sahasrabudhe A., Mikhail A. Prosnikov, Koethe T. et al., Physical Review Research 2024 Vol. 6 No. 2 Article L022005
In the Kitaev magnet 𝛼-RuCl3, the existence of a magnetic-field-induced quantum spin-liquid phase and of anyonic excitations is controversially discussed. We address this elusive, exotic phase via helicity-dependent Raman scattering and analyze the Raman optical activity of excitations as a function of magnetic field and temperature. The hotly debated field regime between 7.5 and 10.5T is characterized by ...
Added: January 26, 2026
Seidov S., Pugach N., Sidorenko A., Beilstein Journal of Nanotechnology 2025 Vol. 16 P. 1668–1676
In this work we consider a spin model composed of a single spin and connected to an infinitely coordinated Ising chain. Theoretical models of this type arise from various fields of theoretical physics, such as theory of open systems, quantum control, and quantum computations. In the thermodynamic limit of an infinite chain, we map the ...
Added: January 12, 2026
Andreeva S., Shchepetilnikov A., Николаев Г. А. et al., Письма в Журнал экспериментальной и теоретической физики 2025 Т. 121 № 7-8 С. 674–680
Квантовый фазовый переход был обнаружен в многодолинной двумерной электронной системе, заключенной в AlAs квантовой яме, при низкой температуре и в больших магнитных полях. Переход возникал при последовательном увеличении угла наклона магнитного поля и сопровождался появлением особенности - острого пика - в продольном сопротивлении образца. Несмотря на то, что тип наблюдаемого фазового перехода крайне сложно установить ...
Added: April 22, 2025
Shaginyan V. R., Msezane A. Z., Artamonov S. et al., Advanced Materials & Sustainable Manufacturing 2025 Vol. 2 No. 1 Article 10001
Quantum spin liquids of frustrated magnets are among the most attractive and basic systems in physics. Frustrated magnets exhibit exceptional properties as insulators and metals, making them advanced materials that represent materials for future technologies. Therefore, a reliable theory describing these materials is of great importance. The fermion condensation theory provides an analytical description of ...
Added: February 24, 2025
Dmitriy S. Shapiro, Sergey V. Remizov, Lebedev A. et al., Physical Review A: Atomic, Molecular, and Optical physics 2022 Vol. 105 No. 2 Article 023321
A dimerized fermion chain, described by Su-Schrieffer-Heeger (SSH) model, is a well-known example of a one-dimensional system with a nontrivial band topology. An interplay of disorder and topological ordering in the SSH model is of great interest owing to experimental advancements in synthesized quantum simulators. In this paper, we investigate a special sort of a ...
Added: July 26, 2023
Смирнов И. А., Черкесова Л. В., Бабаян М. Г. et al., Международный журнал прикладных и фундаментальных исследований 2019 № 7 С. 93–99
Over the past decades, new physical effects have been applied to the construction of standards: the Josephson
quantum effect, the quantum Hall effect, the Meissner effect, the Mossbauer effect, and others. and Hall. The
development of quantum Josephson circuits has created high hopes for reliable processing of quantum information.
Despite the fact that this progress has already led ...
Added: May 10, 2023
Elistratov A., Remizov S., Lozovik Y., Physical Review A: Atomic, Molecular, and Optical physics 2020 Vol. 102 No. 3 Article 042224
Using semion substitution for spin variables we perform an ab initio derivation of effective action for an open quantum two-level system . For this purpose, we introduce, by using the Hubbard-Stratonovich transformation a two-time complex quantum field which average value plays the role of the Green's function for the spin variables. The field thus introduced allows us ...
Added: October 29, 2021
Astrakharchik G. E., Kurbakov I. L., Sychev D. V. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 No. 14 P. L140101-1–L140101-7
Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusionMonte Carlo technique. We predict a quantum phase transition from a gas to a solid phase. The Lindemann ratio and the ...
Added: September 27, 2021
Grigoriev S. V., Utesov O., Chubova N. M. et al., Journal of Experimental and Theoretical Physics 2021 Vol. 132 No. 4 P. 588–595
Polarized small-angle neutron scattering was used for studying of critical fluctuations in the
Dzyaloshinskii–Moriya helimagnets Mn_(1 – x)Fe_xSi with x = 0.10, 0.15, 0.20. The Mn_(1 – x)Fe_xSi compounds are helically ordered below Tc and show a helical fluctuation regime above Tc in a wide range up to TDM. The critical
temperatures Tc and TDM decrease with ...
Added: May 31, 2021
Sergeicheva E. G., S.S. Sosin, Zaliznyak I. A. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 P. 201107–201107
The magnetic phase diagram of a spin-12 chain antiferromagnet Sr2CuO3 is studied by an ultrasound phase-sensitive detection technique. The system is in the extreme proximity of the Luttinger-liquid quantum-critical point and we observe an unusually strong effect of magnetic field, which is very weak compared to the in-chain interaction, on the Néel ordering temperature. Inside ...
Added: December 1, 2020
Radkevich A., Semenov A. G., Zaikin A., Journal of Superconductivity and Novel Magnetism 2020 Vol. 33 No. 8 P. 2335–2339
Superconducting properties of metallic nanowires may strongly depend on specific experimental conditions. Here we consider a setup where superconducting phase fluctuations are restricted at one point inside the wire and equilibrium supercurrent flows along the wire segment of an arbitrary length L. Low-temperature physics of this structure is essentially determined, on one hand, by smooth ...
Added: October 28, 2020
Alex Latyshev, Semenov A. G., Andrei D. Zaikin, Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 1402–1408
We investigate superconductor–insulator quantum phase transitions in ultrathin capacitively coupled superconducting nanowires with proliferating quantum phase slips. We derive a set of coupled Berezinskii–Kosterlitz–Thouless-like renormalization group equations demonstrating that interaction between quantum phase slips in one of the wires gets modified due to the effect of plasma modes propagating in another wire. As a result, ...
Added: October 8, 2020
Радкевич А., Semenov A. G., Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 014520 P. 014520-1–014520-7
The quantum behavior of superconducting nanowires may essentially depend on the employed experimental setup. Here we investigate a setup that enables passing equilibrium supercurrent across an arbitrary segment of the wire without restricting fluctuations of its superconducting phase. The low temperature physics of the system is determined by a combined effect of collective soundlike plasma ...
Added: September 12, 2019
Belemuk A. M., Chtchelkatchev N. M., Mikheyenkov A. V. et al., New Journal of Physics 2018 Vol. 20 No. 6 P. 1–13
We present new results for the system with two species of vector bosons in an optical lattice. In addition to the standard parameters characterizing such a system, we are dealing here with the 'degree of atomic nonidentity', manifesting itself in the difference of tunneling amplitudes and on-site Coulomb interactions. We obtain a cascade of quantum ...
Added: July 14, 2018
K.I. Kugel, Belemuk A. M., Chtchelkatchev N. M. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 9 P. 094435-1–094435-8
We analyze the possible types of ordering in a boson-fermion model. The Hamiltonian is inherently related to the Bose-Hubbard model for vector two-species bosons in optical lattices. We show that such a model can be reduced to the Kugel-Khomskii type spin-pseudospin model, but in contrast to the usual version of the latter model, we are ...
Added: October 17, 2017
Aleiner I. L., Faoro L., Ioffe L., Annals of Physics 2016 Vol. 375 P. 378–406
We extend the Keldysh technique to enable the computation of out-of-time order correlators such as 〈O(t)Õ(0)O(t)Õ(0)〉. We show that the behavior of these correlators is described by equations that display initially an exponential instability which is followed by a linear propagation of the decoherence between two initially identically copies of the quantum many body systems ...
Added: October 21, 2016
Bell M. T., Paramanandam J., Ioffe L. et al., Physical Review Letters 2014 Vol. 112 P. 167001
Added: October 21, 2016
Feigelman M., Poboiko I., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 92 P. 235448
We study a one-dimensional anisotropic XXZ Heisenberg spin-12 chain with weak random fields hizSiz by means of Jordan-Wigner transformation to spinless Luttinger liquid with disorder and bosonization technique. First, we reinvestigate the phase diagram of the system in terms of dimensionless disorder γ=h2/J2≪1 and anisotropy parameter Δ=Jz/Jxy, we find the range of these parameters where ...
Added: October 17, 2016
Svetogorov A. E., Makhlin Y., JETP Letters 2016 Vol. 103 No. 8 P. 535–538
We analyze the influence of a dissipative environment on geometric phases in a quantum system subject to non-adiabatic evolution. We find dissipative contributions to the acquired phase and modification of dephasing, considering the cases of weak short-correlated noise as well as of slow quasi-stationary noise. Motivated by recent experiments, we find the leading non-adiabatic corrections ...
Added: October 13, 2016