Temperature-independent band structure of WTe2 as observed from angle-resolved photoemission spectroscopy

Author(s)

Thirupathaiah, S. ; Jha, Rajveer ; Pal, Banabir ; Matias, J. S. ; Das, P. Kumar ; Vobornik, I. ; Ribeiro, R. A. ; Sarma, D. D.

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 96, n. 16, p. 6-pg., 2017-10-27.

Abstract

Extremely large magnetoresistance (XMR), observed in transition-metal dichalcogenides, WTe2, has attracted recently a great deal of research interest as it shows no sign of saturation up to a magnetic field as high as 60 T, in addition to the presence of type-II Weyl fermions. Currently, there is a great deal of discussion on the role of band structure changes in the temperature-dependent XMR in this compound. In this contribution, we study the band structure of WTe2 using angle-resolved photoemission spectroscopy and first-principles calculations to demonstrate that the temperature-dependent band structure has no substantial effect on the temperature-dependent XMR, as our measurements do not show band structure changes upon increasing the sample temperature between 20 and 130 K. We further observe an electronlike surface state, dispersing in such a way that it connects the top of bulk holelike band to the bottom of bulk electronlike band. Interestingly, similarly to bulk states, the surface state is also mostly intact with the sample temperature. Our results provide valuable information in shaping the mechanism of temperature-dependent XMR in WTe2. (AU)

• FAPESP's process: 11/19924-2 - Study and development of advanced novel materials: electronic, magnetic and nanostructured: an interdisciplinary approach
• Grantee: Carlos Rettori
• Support Opportunities: Research Projects - Thematic Grants