Sparse Big Data Spectroscopy: Advanced techniques for maximally resolving microARPES data on topological insulators

ORAL

Abstract

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 (ARPES) and scanning tunnelling microscopy (STM) 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 hybridisation-like interplay between fluctuations in the surface and bulk state energetics.

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Presenters

  • Erica Kotta

    • New York Univ NYU

Authors

  • Erica Kotta

    • New York Univ NYU

  • Lin Miao

    • New York Univ NYU
    • Southeast University

  • Yishuai Xu

    • New York Univ NYU

  • Stanley A Breitweiser

    • New York Univ NYU

  • Chris Jozwiak

    • Advanced Light Source, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Lab
    • Advanced Light Source

  • Aaron Bostwick

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Lab
    • Advanced Light Source

  • Eli Rotenberg

    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Lab
    • Advanced Light Source, E. O. Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Lab
    • Advanced Light Source

  • Wenhan Zhang

    • Department of Physics and Astronomy, Rutgers University

  • Weida Wu

    • Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers, The State University of New Jersey
    • Department of Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University, New Brunswick

  • Takehito Suzuki

    • Department of Physics, Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Physics, MIT

  • Joseph G Checkelsky

    • Department of Physics, Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Physics, MIT

  • L. Andrew Wray

    • New York Univ NYU