Visualizing electron localization of WS2/WSe2 moiré superlattices in momentum space

Conrad H. Stansbury, M. Iqbal Bakti Utama, Claudia G. Fatuzzo, Emma C. Regan, Danqing Wang, Ziyu Xiang, Mingchao Ding, Kenji Watanabe, Takashi Taniguchi, Mark Blei, Yuxia Shen, Stéphane Lorcy, Aaron Bostwick, Chris Jozwiak, Roland Koch, Sefaattin Tongay, José Avila, Eli Rotenberg, Feng Wang, Alessandra Lanzara

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The search for materials with flat electronic bands continues due to their potential to drive strong correlation and symmetry breaking orders. Electronic moirés formed in van der Waals heterostructures have proved to be an ideal platform. However, there is no holistic experimental picture for how superlattices modify electronic structure. By combining spatially resolved angle-resolved photoemission spectroscopy with optical spectroscopy, we report the first direct evidence of how strongly correlated phases evolve from a weakly interacting regime in a transition metal dichalcogenide superlattice. By comparing short and long wave vector moirés, we find that the electronic structure evolves into a highly localized regime with increasingly flat bands and renormalized effective mass. The flattening is accompanied by the opening of a large gap in the spectral function and splitting of the exciton peaks. These results advance our understanding of emerging phases in moiré superlattices and point to the importance of interlayer physics.

Original languageEnglish (US)
Article numberabf4387
JournalScience Advances
Volume7
Issue number37
DOIs
StatePublished - Sep 2021

ASJC Scopus subject areas

  • General

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