Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs2 and W2As3 with extremely large magnetoresistance

Author:

Lou Rui1234ORCID,Wang Yiyan25,Zhao Lingxiao67,Xu Chenchao8ORCID,Li Man29,Chen Xiaoyang3,Zhang Anmin12,Huang Yaobo9ORCID,Cao Chao8,Chen Genfu1011,Xia Tianlong2,Zhang Qingming110,Ding Hong101112,Wang Shancai2

Affiliation:

1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

2. Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing 100872, China

3. State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200438, China

4. Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden, Germany

5. Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China

6. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China

7. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

8. Department of Physics, Zhejiang University, Hangzhou 310027, China

9. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

10. Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

11. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

12. CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

In transition-metal dipnictides TmPn2 ( Tm = Ta and Nb; Pn = P, As, and 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 NbAs2. The open-orbit topology contributes to a non-negligible part of the Fermi surfaces (FSs), like that of the isostructural compound MoAs2, 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 W2As3, which is also a XMR semimetal with the same space group of C12/ m1 as the TmPn2 family and MoAs2. Our results suggest that the open-orbit FS topology may be a shared feature between XMR materials with the space group of C12/ m1 and, thus, could possibly play a role in determining the corresponding XMR effect together with the electron–hole compensation.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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