Nanoscale Conductivity Imaging of Correlated Electronic States in WSe2/WS2 Moiré Superlattices

Zhaodong Chu, Emma C. Regan, Xuejian Ma, Danqing Wang, Zifan Xu, M. Iqbal Bakti Utama, Kentaro Yumigeta, Mark Blei, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Feng Wang, Keji Lai

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe2/WS2 heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per moiré unit cell that persists for temperatures up to 150 K, consistent with other characterization techniques. In addition, we identify for the first time a Mott insulating state at one electron per moiré unit cell. Appreciable inhomogeneity of the correlated states is directly visualized in the heterobilayer region, indicative of local disorders in the moiré superlattice potential or electrostatic doping. Our work provides important insights on 2D moiré systems down to the microscopic level.

Original languageEnglish (US)
Article number186803
JournalPhysical Review Letters
Volume125
Issue number18
DOIs
StatePublished - Oct 30 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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