Topological surface states above the Fermi level in Hf2Te2P

Boyle, T. J.; Rossi, A.; Walker, M.; Carlson, P.; Miller, M. K.; Zhao, J.; Klavins, P.; Jozwiak, C.; Bostwick, A.; Rotenberg, E.; Taufour, V.; Vishik, I. M.; da Silva Neto, E. H.

doi:10.1103/physrevb.100.081105

Title: Topological surface states above the Fermi level in ${Hf}_{2} {Te}_{2} P$

Journal Article · 12 August 2019 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.100.081105 · OSTI ID:1574335

Boyle, T. J. ^[1]; Rossi, A. ^[2]; Walker, M. ^[1]; Carlson, P. ^[1]; Miller, M. K. ^[1]; Zhao, J. ^[1]; Klavins, P. ^[1]; Jozwiak, C. ^[3]; Bostwick, A. ^[3]; Rotenberg, E. ^[3]; Taufour, V. ^[1]; Vishik, I. M. ^[1]; da Silva Neto, E. H. ^[1]

Univ. of California, Davis, CA (United States)
Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We report a detailed experimental study of the band structure of the recently discovered topological material Hf₂Te₂P. Using the combination of scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy with surface K doping, we probe the band structure of Hf₂Te₂P with energy and momentum resolution above the Fermi level. Our experiments show the presence of multiple surface states with a linear Dirac-like dispersion, consistent with the predictions from previously reported band-structure calculations. In particular, scanning tunneling spectroscopy measurements provide experimental evidence for the strong topological surface state predicted at 460 meV, which stems from the band inversion between Hf-d and Te-p orbitals. As a result, this band inversion comprised of more localized d states could result in a better surface-to-bulk conductance ratio relative to more traditional topological insulators.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE

Grant/Contract Number:: AC02-05CH11231; PHY-1560482

OSTI ID:: 1574335

Alternate ID(s):: OSTI ID: 1556824

Journal Information:: Physical Review B, Vol. 100, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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