Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator

Kotta, Erica; Miao, Lin; Xu, Yishuai; Alexander Breitweiser, S.; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Zhang, Wenhan; Wu, Weida; Suzuki, Takehito; Checkelsky, Joseph; Andrew Wray, L.

doi:10.1038/s41567-019-0759-2

Title: Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator

Journal Article · 12 January 2020 · Nature Physics

DOI: https://doi.org/10.1038/s41567-019-0759-2 · OSTI ID:1788004

^[1]; Miao, Lin ^[2]; Xu, Yishuai ^[1]; Alexander Breitweiser, S. ^[3];

^[4]; Bostwick, Aaron ^[4];

^[4]; Zhang, Wenhan ^[5];

^[5];

^[6];

^[1]

New York Univ. (NYU), NY (United States). Dept. of Physics
New York Univ. (NYU), NY (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
New York Univ. (NYU), NY (United States). Dept. of Physics; Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Topological insulators are bulk semiconductors that manifest in-gap surface states with massless Dirac-like dispersion due to the topological bulk-boundary correspondence principle . These surface states can be manipulated by the interface environment to display various emergent phenomena. Here, we use angle-resolved photoemission spectroscopy and scanning tunnelling microscopy to investigate the interplay of crystallographic inhomogeneity with the topologically ordered band structure in a model topological insulator. We develop quantitative analysis methods to obtain spectroscopic information, in spite of a limited dwell time on each measured point. We find that the band energies vary on the scale of 50 meV across the sample surface, and this enables single sample measurements that are analogous to a multi-sample doping series. By focusing separately on the bulk and surface electrons we reveal a hybridization-like interplay between fluctuations in the surface and bulk state energetics.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1788004

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 16; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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