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Topology of the planar phase of superfluid 3He and bulk-boundary correspondence for three-dimensional topological superconductors
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
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
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
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
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
Autti S., Dmitriev V. V., Mäkinen J. T. et al., Physical Review Letters 2018 Vol. 121 No. 2 P. 025303-1-025303-6
The polar phase of 3He, which is topological spin-triplet superfluid with the Dirac nodal line in the spectrum of Bogoliubov quasiparticles, has been recently stabilized in a nanoconfined geometry. We pump magnetic excitations (magnons) into the sample of polar phase and observe how they form a Bose-Einstein condensate, revealed by coherent precession of the magnetization of ...
Added: November 23, 2018
Makhlin Y., 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. ...
Added: November 23, 2017
Mäkinen J. T., Dmitriev V. V., Nissinen J. et al., Nature Communications 2019 Vol. 10 P. 237-1-237-8
Symmetries of the physical world have guided formulation of fundamental laws, including relativistic quantum field theory and understanding of possible states of matter. Topological defects (TDs) often control the universal behavior of macroscopic quantum systems, while topology and broken symmetries determine allowed TDs. Taking advantage of the symmetry-breaking patterns in the phase diagram of nanoconfined ...
Added: January 22, 2019
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
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
Dmitriev V. V., Soldatov A. A., Yudin A. N., JETP Letters 2016 Vol. 103 P. 643-647
We report results of low frequency nuclear magnetic resonance (NMR) experiments in the superfluid polar phase of 3He, which is stabilized by a new type of “nematic” aerogel—nafen. We have found that an interaction between transverse and longitudinal NMR modes may essentially influence the spin dynamics. Theoretical formulas for NMR resonant frequencies are derived and applied ...
Added: January 22, 2018
Dmitriev V. V., Kutuzov M. S., Soldatov A. A. et al., Physical Review B: Condensed Matter and Materials Physics 2023 Vol. 107 No. 2 Article 024507
We present the results of high magnetic field experiments in pure 3He (in the absence of 4He coverage) in nematic aerogel. In this case the aerogel strands are covered with few atomic layers of solid paramagnetic 3He, which enables the spin-exchange mechanism for 3He quasiparticles scattering. Our earlier NMR experiments showed that in low fields, ...
Added: January 16, 2024
Вальков В. В., Шустин М. С., Аксенов С. В. et al., Успехи физических наук 2022 Т. 192 № 1 С. 3-44
The review discusses properties of superconducting phases with a nontrivial topology and conditions for their implementation in condensed matter, criteria for the appearance of the Majorana-type elementary excitations in solids, as well as principles and experimental methods for identifying Majorana bound states (MBSs). Along with the well-known models of the Kitaev chain and superconducting nanowire ...
Added: March 16, 2021
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
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
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
Dmitriev V. V., Kutuzov M. S., Soldatov A. A. et al., Physical Review Letters 2021 Vol. 127 No. 26 Article 265301
It is known that in low magnetic fields the superfluid transition of 3He in nematic aerogel occurs into the polar phase. Using a vibrating aerogel resonator, we observe that in high magnetic fields this transition splits into two discrete transitions, occurring at different temperatures. According to theoretical models, a new superfluid phase— the β phase— should be realized between ...
Added: October 17, 2022
Dmitriev V. V., Soldatov A. A., Yudin A. N., Physical Review Letters 2018 Vol. 120 No. 7 P. 075301-1-075301-5
We report results of experiments with superfluid 3He confined in aerogels with parallel strands which lead to anisotropic scattering of 3He quasiparticles. We vary boundary conditions for the scattering by covering the strands with different numbers of atomic 4He layers and observe that the superfluid phase diagram and the nature of superfluid phases strongly depend on the coverage. We assume the ...
Added: February 21, 2018
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
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
Autti S., Dmitriev V. V., Mäkinen J. T. et al., Physical Review Letters 2016 Vol. 117 No. 25 P. 255301-1-255301-6
One of the most sought-after objects in topological quantum-matter systems is a vortex carrying half a quantum of circulation. They were originally predicted to exist in superfluid 3He−A but have never been resolved there. Here we report an observation of half-quantum vortices (HQVs) in the polar phase of superfluid 3He. The vortices are created with rotation or by ...
Added: October 24, 2017
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
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
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