Imaging flat bands and correlated quantum phases in WS2/WSe2 moire heterostructures

Monday, April 12, 2021 - 2:30pm

Find out about the quantum phases in heterostructures of atomically thin crystals in this talk presented by graduate student Hongyuan Li of the Feng Wang lab.

Abstract: 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.
Meeting ID: 982 6227 4858
Passcode: 279538
Passcode: 279538

virtual (zoom)
Hongyuan Li
UC Berkeley