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Effects of anisotropy and disorder on the conductivity of Weyl semimetals
Physical Review B: Condensed Matter and Materials Physics. 2015. Vol. 92. No. 19. P. 1-15.
Ya. I. Rodionov, Kugel K.
We study dc conductivity of a Weyl semimetal with uniaxial anisotropy (Fermi velocity ratio ξ=v⊥/v∥≠1) considering the scattering of charge carriers by a wide class of impurity potentials, both short- and long-range. We obtain the ratio of transverse and longitudinal (with respect to the anisotropy axis) conductivities as a function of both ξ and temperature. We find that the transverse and longitudinal conductivities exhibit different temperature dependence in the case of short-range disorder. For general long-range disorder, the temperature dependence (∼T4) of the conductivity turns out to be insensitive of the anisotropy in the limits of strong (ξ≫ and ≪1) and weak (ξ≈1) anisotropy.
Keywords: Weyl semimetals
Ya.I. Rodionov, Kugel K., Aronzon B. A. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 20 P. 205105
We study the effect of random potentials created by different types of impurities on the transverse magnetoresistance
of Weyl semimetals. We show that the magnetic field and temperature dependence of the
magnetoresistance is strongly affected by the type of impurity potential.We analyze in detail two limiting cases:
(i) the ultraquantum limit, when the applied magnetic field is so ...
Added: December 6, 2020
Ya. I. Rodionov, Kugel K., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 19 P. 195108-13
Using the Landau-Zener-Stückelberg-Majorana-type (LZSM) semiclassical approach, we study both graphene and a thin film of a Weyl semimetal subjected to a strong AC electromagnetic field. The spectrum of quasi energies in the Weyl semimetal turns out to be similar to that of a graphene sheet. Earlier it has been predicted qualitatively that the transport properties ...
Added: February 11, 2019
Rodionov Y. I., K.I. Kugel, Nori F., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 19 P. 195108-1-195108-13
Using the Landau-Zener-Stuckelberg-Majorana-type (LZSM) semiclassical approach, we study both graphene and a thin film of aWeyl semimetal subjected to a strong ac electromagnetic field. The spectrum of quasienergies in the Weyl semimetal turns out to be similar to that of a graphene sheet. It has been predicted qualitatively that the transport properties of strongly irradiated ...
Added: February 19, 2017
Rodionov Yaroslav I, Physical Review B: Condensed Matter and Materials Physics 2018 P. 081114-1-081114-6
We study thermodynamic manifestations of the chiral anomaly in disordered Weyl semimetals. We focus, in particular, on the effect which we call “adiabatic dechiralization,” the phenomenon in which a change in temperature and/or an absorption or release of heat results from applying parallel electric and magnetic fields that change the imbalance of quasiparticles with different ...
Added: February 8, 2019
O. O. Shvetsov, Esin V. D., Barash Y. S. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 No. 3 P. 035304-1-035304-6
We experimentally study lateral electron transport between two 5−μm-spaced superconducting indium leads on a top of magnetic Weyl semimetal Co3Sn2S2. For the disordered magnetic state of Co3Sn2S2 crystal, we observe only the Andreev reflection in the proximity of each of the leads, which is indicative of highly transparent In-Co3Sn2S2 interfaces. If the sample is homogeneously magnetized, it demonstrates a well-developed ...
Added: December 1, 2020
Verbus V. A., Protogenov A. P., Chulkov E., / Cornell University. Series cond-mat "arxiv.org". 2014. No. 1406.1507.
Weyl semimetal is a three-dimensional material with a conical spectrum near an even number of point nodes, where two bands touch each other. Here we study spectral properties of surface electron states in such a system. We show that the density of surface states possesses a logarithmic singularity for the energy to 0. It decreases ...
Added: March 8, 2016
E. V. Deviatov, O. O. Shvetsov, EPL 2018 Vol. 122 No. 2 P. 27004-p1-27004-p5
We experimentally investigate charge transport through the interface between a niobium superconductor and a three-dimensional WTe2 Weyl semimetal. In addition to classical Andreev reflection, we observe sharp non-periodic subgap resistance resonances. From an analysis of their positions, magnetic field and temperature dependences, we can interpret them as an analog of Tomasch oscillations for transport along ...
Added: December 1, 2020
Ya. I. Rodionov, K. I. Kugel, Aronzon B. A., Physical Review B: Condensed Matter and Materials Physics 2023 Vol. 107 No. 15 Article 155120
We study the effects of strong Coulomb disorder on the transverse magnetoresistance in Weyl semimetals at low temperatures. Using the diagrammatic technique and the Keldysh model to sum up the leading terms in the diagrammatic expansion, we find that the linear magnetoresistance exhibits a strong renormalization due to the long-range nature of the Coulomb interaction ρ_xx ∝ Hln(eHℏv^2/cT^2_imp), ...
Added: May 3, 2023
Chtchelkatchev N., Berman O., Kezerashvili R. et al., Physics Letters A 2021 Vol. 399 P. 127294-1-127294-6
Recently discussed topological materials Weyl-semimetals (WSs) combine both: high electron mobility comparable with graphene and unique topological protection of Dirac points. We present novel results related to electromagnetic field propagation through WSs. It is predicted that transmission of the normally incident polarized electromagnetic wave (EMW) through the magnetic WS strongly depends on the orientation of ...
Added: September 27, 2021
K.I. Kugel, Rodionov Y. I., Nori F., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 92 No. 19 P. 195117-1-195117-15
We study dc conductivity of a Weyl semimetal with uniaxial anisotropy (Fermi velocity ratio ξ = v⊥/v = 1)
considering the scattering of charge carriers by a wide class of impurity potentials, both short- and long-range.We
obtain the ratio of transverse and longitudinal (with respect to the anisotropy axis) conductivities as a function of
both ξ and temperature. ...
Added: March 11, 2016
Rodionov Yaroslav I, Tikhonov K., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 4 P. 1-5
We study the Landau levels (LLs) of a Weyl semimetal with two adjacent Weyl nodes. We consider different orientations η = ∠(B,k0) of magnetic field B with respect to k0, the vector of Weyl node splitting. A magnetic field facilitates the tunneling between the nodes, giving rise to a gap in the transverse energy of ...
Added: February 8, 2019
Bednik G., K. S. Tikhonov, Syzranov S. V., Physical Review Research 2020 Vol. 2 P. 023124-1-023124-15
Internodal dynamics of quasiparticles in Weyl semimetals manifest themselves in hydrodynamic, transport, and thermodynamic phenomena and are essential for potential valleytronic applications of these systems. In an external magnetic field, coherent quasiparticle tunnelling between the nodes modifies the quasiparticle dispersion and, in particular, opens gaps in the dispersion of quasiparticles at the zeroth Landau level. ...
Added: November 12, 2020