Electronic structure in a transition metal dipnictide TaAs2
Abstract
The family of transition-metal dipnictides has been of theoretical and experimental interest because this family hosts topological states and extremely large magnetoresistance (MR). Recently, T a A s 2 , a member of this family, has been predicted to support a topological crystalline insulating state. Here, by using high-resolution angle-resolved photoemission spectroscopy (ARPES), we reveal both closed and open pockets in the metallic Fermi surface (FS) and linearly dispersive bands on the ( 2 ‾ 01 ) surface, along with the presence of extreme MR observed from magneto-transport measurements. A comparison of the ARPES results with first-principles computations shows that the linearly dispersive bands on the measured surface of T a A s 2 are trivial bulk bands. The absence of symmetry-protected surface state on the ( 2 ‾ 01 ) surface indicates its topologically dark nature. The presence of open FS features suggests that the open-orbit fermiology could contribute to the extremely large MR of T a A s 2 .
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 14, 2023
- Source ID
- 10.1088/1361-648x/ad04fc
Entities
People
- Anup Pradhan Sakhya
- Arun Bansil
- Bahadur Singh
- BaoKai Wang
- Cheng-yi Huang
- Dariusz Kaczorowski
- J F Mitchell
- Jesse E. Thompson
- Jonathan D Denlinger
- M. Mofazzel Hosen
- Madhab Neupane
- Masahiro Ishigami
- Mojammel A. Khan
- Sabin Regmi
Organizations
- Air Force Office of Scientific Research
- Department of Atomic Energy
- Division of Materials Research
- Office of Basic Energy Sciences
- Office of Science