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In transition-metal dipnictides $TmPn_2$ ($Tm$ = Ta, Nb; $Pn$ = P, As, Sb),the origin of extremely large magnetoresistance (XMR) is yet to be studied bythe direct visualization of the experimental band structures. Here, usingangle-resolved photoemission spectroscopy, we map out the three-dimensionalelectronic structure of NbAs$_2$. The open-orbit topology contributes to anon-negligible part of the Fermi surfaces (FSs), like that of the isostructuralcompound MoAs$_2$, where the open FS is proposed to likely explain the originof XMR. We further demonstrate the observation of open characters in theoverall FSs of W$_2$As$_3$, which is also a XMR semimetal with the same spacegroup of $C$12/$m$1 as $TmPn_2$ family and MoAs$_2$. Our results suggest thatthe open-orbit FS topology may be a shared feature between XMR materials withthe space group of $C$12/$m$1, and thus could possibly play a role indetermining the corresponding XMR effect together with the electron-holecompensation.

applied physics letters

Electronic structure and open-orbit Fermi surface topology in  isostructural semimetals NbAs$_2$ and W$_2$As$_3$ with extremely large  magnetoresistance