Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator
Name
1910.08834.pdf
Description
Submitted version
Size
5.3 MB
Format
Adobe PDF
Checksum (MD5)
8a2b8c7d609f97074d892bd6874d2532
Author(s)
Kotta, Erica
Miao, Lin
Xu, Yishuai
Alexander Breitweiser, S
Jozwiak, Chris
Bostwick, Aaron
Rotenberg, Eli
Zhang, Wenhan
Wu, Weida
Suzuki, Takehito
Date Issued
March 2020
Journal
Nature Physics
Publisher
Springer Science and Business Media LLC
Citation
Kotta, Erica et al. "Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator." Nature Physics 16, 3 (March 2020): 285–289 © 2020 The Author(s)
Version
Original manuscript
Abstract
Topological insulators are bulk semiconductors that manifest in-gap surface states with massless Dirac-like dispersion due to the topological bulk-boundary correspondence principle1–3. These surface states can be manipulated by the interface environment to display various emergent phenomena4–11. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1038/S41567-019-0759-2
