TY - JOUR

T1 - Hidden Weyl points in centrosymmetric paramagnetic metals

AU - Gresch, Dominik

AU - Wu, QuanSheng

AU - Winkler, Georg W.

AU - Soluyanov, Alexey A.

PY - 2017/3/2

Y1 - 2017/3/2

N2 - The transition metal dipnictides TaAs2, TaSb2, NbAs2 and NbSb2 have recently sparked interest for exhibiting giant magnetoresistance. While the exact nature of the magnetoresistance in these materials is still under active investigation, there are experimental results indicating that it is of the anisotropic negative variety. We study the effect of magnetic fields on the band structure topology of these materials by applying Zeeman splitting. In the absence of a magnetic field, we find that the materials are weak topological insulators, which is in agreement with previous studies. When the magnetic field is applied, we find that type-II Weyl points form. This result is found first from a symmetry argument, and then numerically for a k . p model of TaAs2 and a tight-binding model of NbSb2. This effect could be of help in the search for an explanation of the anomalous magnetoresistance in these materials.

AB - The transition metal dipnictides TaAs2, TaSb2, NbAs2 and NbSb2 have recently sparked interest for exhibiting giant magnetoresistance. While the exact nature of the magnetoresistance in these materials is still under active investigation, there are experimental results indicating that it is of the anisotropic negative variety. We study the effect of magnetic fields on the band structure topology of these materials by applying Zeeman splitting. In the absence of a magnetic field, we find that the materials are weak topological insulators, which is in agreement with previous studies. When the magnetic field is applied, we find that type-II Weyl points form. This result is found first from a symmetry argument, and then numerically for a k . p model of TaAs2 and a tight-binding model of NbSb2. This effect could be of help in the search for an explanation of the anomalous magnetoresistance in these materials.

KW - Weyl semimetal

KW - chiral anomaly

KW - magnetoresistance

KW - Zeeman splitting

KW - LOCALIZED WANNIER FUNCTIONS

KW - AUGMENTED-WAVE METHOD

KW - ELECTRONIC-STRUCTURE

KW - MAGNETORESISTANCE

KW - NBAS2

KW - TAAS2

KW - TOOL

U2 - 10.1088/1367-2630/aa5de7

DO - 10.1088/1367-2630/aa5de7

M3 - статья

VL - 19

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

M1 - 035001

ER -