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Article overview
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Negative Magnetoresistance in Topological Semimetals of Transition-Metal Dipnictides with Nontrivial Z2 Indices | | Yupeng Li
; Zhen Wang
; Yunhao Lu
; Xiaojun Yang
; Zhixuan Shen
; Feng Sheng
; Chunmu Feng
; Yi Zheng
; Zhu-An Xu
; | | Date: |
13 Mar 2016 | | Abstract: | Negative magnetoresistance (NMR) induced by the Adler-Bell-Jackiw anomaly is
regarded as the most prominent quantum signature of Weyl semimetals when
electrical field $E$ is collinear with the external magnetic field $B$. In this
article, we report universal NMR in nonmagnetic, centrosymmetric transition
metal dipnictides MPn$_{2}$ (M=Nb and Ta; Pn=As and Sb), in which the existence
of Weyl fermions can be explicitly excluded. Using temperature-dependent
magnetoresistance, Hall and thermoelectric coefficients of Nernst and Seebeck
effects, we determine that the emergence of the NMR phenomena in MPn$_{2}$ is
coincident with a Lifshitz transition, corresponding to the formation of unique
electron-hole-electron ($e$-$h$-$e$) pockets along the $I-L-I’$ direction.
First-principles calculations reveal that, along the $I-L-I’$ line, the
$d_{xy}$ and $d_{x^{2}-y^{2}}$ orbitals of the transition metal form tilted
nodal rings of band crossing well below the Fermi level. Strong spin-orbital
coupling gaps all the crossing points and creates the characteristic
$e$-$h$-$e$ structure, making MPn$_{2}$ a topological semimetal with
$mathbb{Z}_2$ indices of [0;(111)]. By excluding the weak localization
contribution of the bulk states, we conclude that the universal NMR in
MPn$_{2}$ may have an exotic origin in topological surface states, which
appears in pairs with opposite spin-momentum locking on nontrivial surfaces. | | Source: | arXiv, 1603.4056 | | Services: | Forum | Review | PDF | Favorites | |
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