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Entanglement spectrum in superfluid phases of 3He
JETP Letters. 2017. Vol. 106. No. 11. P. 739-742.
We analyze the entanglement spectrum of superfluid phases of $^3$He, the 3D B-phase and the planar phase in two dimensions. We find explicitly the wave functions of the low-lying eigenstates, including Majorana zero modes, as well as the corresponding part of the spectrum of the entanglement Hamiltonian.
Publication based on the results of:
Ефимкин Д. К., Yu.E. Lozovik, A.A. Sokolik, Physical Review B: Condensed Matter and Materials Physics 2012 Vol. 86 No. 11-5436 P. 1-9
We consider the pairing of massless Dirac electrons and holes located on opposite surfaces of thin films of “strong” three-dimensional topological insulators. Such pairing is predicted to give rise to a topological exciton condensate with unusual properties. We estimate the quantitatively achievable critical temperature of the pairing while taking into account the self-consistent screening of ...
Added: March 14, 2013
Vasenko A. S., Golubov A. A., Silkin V. M. et al., JETP Letters 2017 Vol. 105 No. 8 P. 489-490
We study the effect of the Fermi surface anisotropy (hexagonal warping) on the superconducting pair potential, induced in a three-dimensional topological insulator (TI) by proximity with an s-wave superconductor (S) in presence of a magnetic moment of a nearby ferromagnetic insulator (FI). In the previous studies similar problem was treated with a simplified Hamiltonian, describing ...
Added: April 7, 2017
Mal'shukov A., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 P. 134514-1-134514-7
A nonuniform in-plane Zeeman field can induce spontaneous supercurrents of spin-orbit-coupled electrons in
superconducting two-dimensional systems and thin films. In this work it is shown that current vortices can be
created at the ends of a long homogeneously magnetized strip of a ferromagnetic insulator, which is deposited on
the surface of a three-dimensional topological insulator. The s-wave superconductivity ...
Added: January 20, 2021
Ефимкин Д. К., Yu.E. Lozovik, A.A. Sokolik, Journal of Magnetism and Magnetic Materials 2012 Vol. 324 No. 21 P. 3610-3612
Collective plasmon excitations in a helical electron liquid on the surface of strong three-dimensional topological insulator are considered. The properties and internal structure of these excitations are studied. Due to spin-momentum locking in helical liquid on a surface of topological insulator, the collective excitations should manifest themselves as coupled charge- and spin-density waves. ...
Added: March 14, 2013
Kuntsevich A., Габдуллин А. А., Prudkogliad Valerii Andreevich et al., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 23 P. 235401-1-235401-8
Bismuth chalcogenides are the most studied 3D topological insulators. As a rule, at low temperatures, thin films of these materials demonstrate positive magnetoresistance due to weak antilocalization. Weak antilocalization should lead to resistivity decrease at low temperatures; in experiments, however, resistivity grows as temperature decreases. From transport measurements for several thin films ( with various ...
Added: February 24, 2018
Karabassov T., Bobkova I. V., Golubov A. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 22 Article 224509
It is well-known that the ground state of homogeneous superconducting systems with spin-orbit
coupling (SOC) in the presence of the Zeeman field is the so-called helical state, which is characterized
by the phase modulation of the order parameter, but zero supercurrent density. In this work
we investigate the realization of the helical state in a hybrid system with ...
Added: November 24, 2022
Backens S., Shnirman A., Makhlin Y., JETP Letters 2022 Vol. 116 No. 12 P. 891-895
We consider Majorana zero modes in a Josephson junction on top of a topological insulator in transverse magnetic field. Majorana zero modes reside at periodically located nodes of Josephson vortices. We find that hybridization of these modes is prohibited by symmetries of the problem at vanishing chemical potential, which ensures better protection of zero modes ...
Added: December 10, 2022
Kuntsevich A., Materials 2022 Vol. 14 No. 24 P. 7528-7528
Search for doped superconducting topological insulators is of prime importance for new quantum technologies. We report on fabrication of Sr-doped Bi2Te3 single crystals. We found that Bridgman grown samples have p-type conductivity in the low 10^19 cm^(−3), high mobility of 4000 cm^2*V^(−1)s^(−1), crystal structure independent on nominal dopant content, and no signs of superconductivity. We also studied molecular ...
Added: June 17, 2022
Овешников Л. Н., Нехаева Е. И., Прудкогляд В. А. et al., Письма в Журнал экспериментальной и теоретической физики 2016 Т. 104 № 9 С. 651-657
В работе исследовалась магнетопроводимость тонких пленок Bi2Se3 с защитным слоем Se, выра
щенных на подложках (111) BaF2. Наблюдаемая отрицательная магнетопроводимость в малых полях,
обусловленная эффектом слабой антилокализации, так же как и осцилляции Шубникова–де Гааза в
больших полях, определяется только перпендикулярной к плоскости пленки компонентой магнитного
поля. Полученные экспериментальные результаты могут быть разумно объяснены в предположении на
личия в исследуемых пленках ...
Added: December 6, 2016
Burmistrov I., Repin E., JETP Letters 2015 Vol. 148 No. 3 P. 509
We explore a combined effect of hexagonal warping and a finite effective mass on both the tunneling density of electronic surface states and the structure of Landau levels of 3D topological insulators. We find the increasing warping to transform the square-root van Hove singularity into a logarithmic one. For moderate warping, an additional logarithmic singularity ...
Added: December 3, 2016
Мальшуков А. Г., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 P. 035301-1-035301-7
A nonstationary anomalous Hall current is calculated for a voltage biased Josephson junction, which is composed of two s-wave superconducting contacts deposited on the top of a three-dimensional topological insulator (TI). A homogeneous Zeeman field was assumed at the surface of the TI. The problem has been considered within the ballistic approximation and on the ...
Added: March 11, 2020
Fedotov N., Zaitsev-Zotov S., Physica Status Solidi - Rapid Research Letters 2019 Vol. 13 No. 5 Article 1800617
Topologically protected surface states of three-dimensional topological insulators provide a model framework for studying massless Dirac electrons in two dimensions. Usually a step on the surface of a topological insulator is treated as a scatterer for the Dirac electrons, and the study of its effect is focused on the interference of the incident and scattered ...
Added: October 29, 2021
Efimkin D., Yurii E Lozovik, Alexey A Sokolik, Nanoscale Research Letters 2012 Vol. 7 No. 163 P. 1-10
We study collective excitations in a helical electron liquid on a surface of three-dimensional topological insulator. Electron in helical liquid obeys Dirac-like equation for massless particles and direction of its spin is strictly determined by its momentum. Due to this spin-momentum locking, collective excitations in the system manifest themselves as coupled charge- and spin-density waves. ...
Added: March 14, 2013
Frolov A. V., Orlov A. P., Sinchenko A. A. et al., Journal of Physics: Conference Series 2018 Vol. 941 P. 1-4
We report preparation of nanoribbons (crossection ~ 250*25 nm2) by focused ion beam etching of single-crystalline Bi2Se3 and detailed measurements of their magnetoresistance at temperatures down to 4.2 K, magnetic field up to 9 T. In a magnetic field parallel to the axis of nanowire the magnetoresistance shows up oscillations. Surprisingly, the Fourier analysis shows ...
Added: February 25, 2018
Piatrusha S. U., Khrapai V., Kvon Z. D. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 245417 P. 1-10
We investigate lateral p−n junctions, electrostatically defined in 14-nm-wide HgTe-based quantum wells (QWs) with inverted band structure. The p−n junction resistances are close to h/2e2, consistent with some previous experiments on 8–10nm QWs, and the current-voltage characteristics are highly linear, indicating the transport via ballistic helical edge states. Shot noise measurements are performed in order to further verify the underlying transport mechanism. We ...
Added: February 1, 2019
Yevtushenko O. M., Yudson V., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 Article 195414
Dynamical magnetic impurities (MI) are considered as a possible origin for suppression of the ballistic helical transport on edges of two-dimensional (2D) topological insulators. The MIs provide a spin-flip backscattering of itinerant helical electrons. Such a backscattering reduces the ballistic conductance if the exchange interaction between the MI and the electrons is anisotropic and the ...
Added: December 6, 2021
Pudalov V., Сахин В. О., Куковицкий Е. Ф. et al., Письма в Журнал экспериментальной и теоретической физики 2022 Т. 115 № 4 С. 270-276
The formation of nanosized charge droplets in the bulk of a three-dimensional topological insulator
Bi1.08Sn0.02Sb0.9Te2S was evidenced using electron spin resonance. Since electrons and holes are “locked” in
these droplets far apart from each other, their participation in bulk conductivity is possible only due to thermal
activation or to variable range hopping. Our transport measurements give evidence that ...
Added: November 16, 2022
S. V. Demishev, Gilmanov M. I., Samarin A. N. et al., Applied Magnetic Resonance 2020 Vol. 51 No. 1 P. 71-84
The low temperature (T < 5 K) electron spin resonance in topological Kondo insulator SmB6 is investigated. It is shown that spin relaxation time of the paramagnetic centers responsible for low temperature electron spin resonance in SmB6 is about ~ 10−8 s, which exceeds by five orders of magnitude the widely accepted spin and charge fluctuation time ~ 10−13 s in the homogeneous ...
Added: December 24, 2020
Aronzon B. A., Oveshnikov L. N., Prudkoglyad V.A. et al., Journal of Magnetism and Magnetic Materials 2018 Vol. 459 No. 1 P. 331-334
Structural, magnetic and magnetotransport properties of (Bi1-xEux)2Se3 thin films have been studied experimentally as a function of Eu content. The films were synthesized by MBE. It is demonstrated that Eu distribution is not uniform, it enter quint-layers forming inside them plain (pancake-like) areas containing Eu atoms, which sizes and concentration increase with the growth of Eu content. Positive ...
Added: July 13, 2018
A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 P. 064515-1-064515-7
It is shown that the spin-orbit and Zeeman interactions result in phase shifts of Andreev-reflected
holes propagating at the surface of a topological insulator, or in Rashba spin-orbit-coupled two
dimensional normal metals, which are in a contact with an s-wave superconductor. Due to interference
of holes reflected through different paths of Andreev interferometer the electric current through
external contacts ...
Added: February 6, 2019
Nagaev K., Remizov S., Shapiro D.S., JETP Letters 2018 Vol. 108 P. 664-669
We calculate the frequency-dependent shot noise in the edge states of a two-dimensional topological insulator coupled to a magnetic impurity with spin S = 1/2 of arbitrary anisotropy. If the anisotropy is absent, the noise is purely thermal at low frequencies, but tends to the Poisson noise of the full current I at high frequencies. If the interaction only ...
Added: October 29, 2021
Makhlin Y., Silaev M., Volovik G. E., Physical Review B: Condensed Matter and Materials Physics 2014 Vol. 89 P. 174502
We provide topological classification of possible phases with the symmetry of the planar phase of superfluid He3. Compared to the B phase [class DIII in classification of A. Altland and M. R. Zirnbauer, Phys. Rev. B 55, 1142 (1997)], it has an additional symmetry, which modifies the topology. We analyze the topology in terms of ...
Added: October 15, 2016
Katushkina O. A., Quemerais E., Izmodenov V.V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2017 Vol. 122 No. 11 P. 10921-10937
In this work, we present for the first time the Lyman α intensities measured by Voyager 1/UVS in 2003–2014 (at 90–130 AU from the Sun). During this period Voyager 1 measured the Lyman α emission in the outer heliosphere at an almost fixed direction close to the upwind (i.e.“ toward the interstellar flow). The data show an unexpected behavior in 2003–2009: the ...
Added: January 26, 2018
Aaij R., Abdelmotteleb A. S., Abellan Beteta C. et al., The European Physical Journal C - Particles and Fields 2023 Vol. 83 Article 543
https://link.springer.com/article/10.1140/epjc/s10052-023-11673-x#Abs1 ...
Added: December 4, 2023