paper

Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs $_{2}$ and W $_{2}$ As $_{3}$ with extremely large magnetoresistance

arXiv:2203.11848 · doi:10.1063/5.0087141

Abstract

In transition-metal dipnictides $T m P n_{2}$ ( $T m$ = Ta, Nb; $P n$ = P, As, Sb), the origin of extremely large magnetoresistance (XMR) is yet to be studied by the direct visualization of the experimental band structures. Here, using angle-resolved photoemission spectroscopy, we map out the three-dimensional electronic structure of NbAs $_{2}$ . The open-orbit topology contributes to a non-negligible part of the Fermi surfaces (FSs), like that of the isostructural compound MoAs $_{2}$ , where the open FS is proposed to likely explain the origin of XMR. We further demonstrate the observation of open characters in the overall FSs of W $_{2}$ As $_{3}$ , which is also a XMR semimetal with the same space group of $C$ 12/ $m$ 1 as $T m P n_{2}$ family and MoAs $_{2}$ . Our results suggest that the open-orbit FS topology may be a shared feature between XMR materials with the space group of $C$ 12/ $m$ 1, and thus could possibly play a role in determining the corresponding XMR effect together with the electron-hole compensation.

7 pages, 4 figures, Editor's pick

Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs2​ and W2​As3​ with extremely large magnetoresistance

Abstract

Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs $_{2}$ and W $_{2}$ As $_{3}$ with extremely large magnetoresistance