Van der Waals heterostructures of atomically thin crystals offer an exciting new platform to design flat electronic bands for novel correlated quantum phases. We systematically study the flat band and associated correlated states in WS2/WSe2 moire heterostructues using scanning tunneling microscopy (STM). We reveal that three-dimensional lattice reconstruction plays a key role in determining the flat moire minibands in the WS2/WSe2 heterostructure. We further probe correlated electron physics in the moire flatband using scanning tunneling spectroscopy. In particular, we develop a new non-invasive STM technique that allows us to directly visualize the emerging Wigner crystal states at fractional fillings of the WS2/WSe2 moire superlattice.
Speaker: Hongyuan Li, UC Berkeley
Editor's Note: This lecture replaces the one by Zuocheng Zhang, UC Berkeley, originally scheduled for this date.
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