Flavor-Sensitive Optical Imaging of Flat Band Graphene

ORAL

Abstract

Isospin polarization plays a crucial role in flatband graphene systems. Here, we report a novel optical sensing technique of flavor (isospin) polarization based on short-range interaction with excitons. Through a systematic study across crystalline and moiré graphene systems, we demonstrate the capability of our technique to distinguish between flavor polarization and other types of Fermi surface changes, which would give similar responses in compressibility measurements. With wide-field optical imaging, our technique also enables high-throughput mapping of flavor polarization domains across a broad temperature range and device structures.

*UCSBNational Science FoundationU.S. Air Force

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Presenters

  • Tian Xie

    • university of California, Santa Barbra

Authors

  • Tian Xie

    • university of California, Santa Barbra

  • Zhiyuan Cui

    • UCSB

  • Richen Xiong

    • University of California, Santa Barbara

  • Siyuan Xu

    • University of California, Santa Barbara
    • UCSB

  • Ludwig F Holleis

    • University of California, Santa Barbara

  • Yi Guo

    • UCSB

  • Owen I Sheekey

    • University of California, Santa Barbara
    • University of California Santa Barbara
    • University of Santa Barbara
    • UCSB

  • Allan H MacDonald

    • University of Texas at Austin

  • Tobias M Wolf

    • University of Texas at Austin
    • The University of Texas at Austin

  • Andrea F Young

    • University of California, Santa Barbara

  • CHENHAO JIN

    • Cornell University
    • UCSB