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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