Publication

Article Metrics

Citations


Online attention

Bulk and surface electronic structure of hexagonal structured PtBi2 studied by angle-resolved photoemission spectroscopy

DOI: 10.1103/PhysRevB.94.235140 DOI Help

Authors: Q. Yao (Fudan University; Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , Y. P. Du (Nanjing University; Collaborative Innovation Centre of Advanced Microstructures, Nanjing) , X. J. Yang (Zhejiang University) , Y. Zheng (Zhejiang University) , D. F. Xu (Fudan University) , X. H. Niu (Fudan University) , X. P. Shen (Fudan University) , H. F. Yang (Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences) , P. Dudin (Diamond Light Source) , T. K. Kim (Diamond Light Source) , M. Hoesch (Diamond Light Source) , I. Vobornik (CNR-IOM) , Z.-a. Xu (Collaborative Innovation Centre of Advanced Microstructures, Nanjing; Zhejiang University;) , X. G. Wan (Nanjing University; Collaborative Innovation Centre of Advanced Microstructures, Nanjing) , D. L. Feng (Fudan University; Collaborative Innovation Centre of Advanced Microstructures, Nanjing) , D. Shen (Chinese Academy of Sciences; CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 94

State: Published (Approved)
Published: December 2016
Diamond Proposal Number(s): 12848

Abstract: PtBi2 with a layered hexagonal crystal structure was recently reported to exhibit an unconventional large linear magnetoresistance, while the mechanism involved is still elusive. Using high-resolution angle-resolved photoemission spectroscopy, we present a systematic study on its bulk and surface electronic structure. Through careful comparison with first-principle calculations, our experiment distinguishes the low-lying bulk bands from entangled surface states, allowing the estimation of the real composition of samples. We find significant electron doping in PtBi2, implying a substantial Bi-deficiency-induced disorder therein. Intriguingly, we discover a Dirac-cone-like surface state on the boundary of the Brillouin zone, which is identified as an accidental Dirac band without topological protection. Our findings exclude linear band dispersion in the quantum limit as the cause of the unconventional large linear magnetoresistance but give support to the classical disorder model from the perspective of the electronic structure.

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: Elettra Synchrotron Trieste