Author(s): Zhang, JF (Zhang, Jian-Feng); Zhang, XW (Zhang, Xiao-Wei); Zheng, XH (Zheng, Xiaohu); Liu, HW (Liu, Haiwen); Mi, J (Mi, Jian); Yuan, ZJ (Yuan, Zhujun); Jia, S (Jia, Shuang); Xie, XC (Xie, X. C.); Zhang, C (Zhang, Chi)

Source: PHYSICAL REVIEW B Volume: 102 Issue: 20 Article Number: 205413 DOI: 10.1103/PhysRevB.102.205413 Published: NOV 12 2020

Abstract: We perform magnetotransport and microwave (MW) photovoltage (PV) measurements in bulk tantalum arsenide (TaAs) crystal with c-(001) crystalline surface at low temperature (T). Two sets of quantum oscillations from different topological Weyl electron pockets are found in magnetoresistance and PV. Similar to the magnetoresistance, PV oscillates with the density of states around the Fermi level. Our observation qualitatively countenances a model which holds that the PV oscillations originate from nonequilibrium chiral Weyl fermions. Moreover, as a probe for detecting local electron states, PV is proved to be more sensitive than magnetoresistances. Microwave photovoltaic effect provides an effective method to explore topological electron structure and novel quantum phases in three-dimensional Weyl systems.

Accession Number: WOS:000588581200004

ISSN: 2469-9950

eISSN: 2469-9969

Full Text: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.205413