Studying Transition Metal Dichalcogenide Superlattices with nano-ARPES

ORAL

Abstract

Two-dimensional layered materials, especially monolayer transition metal dichalcogenides, have demonstrated lasting impact as a platform for combining and tuning electronic and optical behaviors on the nanoscale. The realization that moiré superlattices in these systems provide tunable control over correlations has sparked renewed interest through analogy to the family of high-temperature superconductors and in light of new phenomena such as moiré excitons. As a complement to modeling, a bottom-up understanding of these phenomena and interlayer hybridization motivates direct measurements of the electronic structures of the host materials. Nano-ARPES enables these experiments on clean, mechanically-exfoliated heterostructures where the impact of substrate and superlattice interaction on the electrons can be fully explored. In this talk, I show how this technique can address basic questions of electronic and structural order in a few model systems: heterobilayer interfaces, and in the interface of TMD monolayers with a substrate. Among the rich phenomena present at the interface, we will focus especially on the presence or absence of hybridization effects in short and long wavelength superlattices.

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Presenters

  • Conrad Stansbury

    • University of California, Berkeley

Authors

  • Conrad Stansbury

    • University of California, Berkeley

  • Iqbal Utama

    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley

  • Claudia Fatuzzo

    • Materials Science Division, Lawrence Berkeley National Laboratory
    • Materials Science Department, Lawrence Berkeley National Lab
    • University of California, Berkeley

  • 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

  • José Avila

    • Synchrotron SOLEIL
    • Synchrotron SOLEIL and Universite Paris-Saclay
    • SOLEIL

  • 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

  • Feng Wang

    • University of California at Berkeley
    • University of California, Berkeley
    • UC Berkeley
    • Physics, University of California, Berkeley
    • University of California, Berkeley and MSD, LBNL
    • Department of Physics, University of California, Berkeley

  • Alessandra Lanzara

    • University of California, Berkeley
    • Physics, University of California, Berkeley