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R. G. Herb Condensed Matter Seminar
Monolayers and bilayers of the topological semimetal WTe2
Date: Thursday, December 15th
Time: 10:00 am - 6:00 pm
Place: 5310 Chamberlin
Speaker: David Cobden, U Washington
Abstract: Layered transition metal chalcogenides have a wide range of electronic properties, and many can readily be exfoliated down to a single monolayer as long as they are kept in an inert atmosphere. In the last few years we have been experimenting with one of these, WTe2, which in the bulk is a semimetal having topological features in its band structure. Monolayers of WTe2 exhibit the edge conduction properties expected of a two-dimensional topological insulator, although the transport properties of the insulating state are puzzling and suggestive of strong electron-hole correlations competing with a superconducting pairing instability. Bilayers show intermediate properties between the monolayer and the metallic bulk, and additionally exhibit sliding ferroelectricity. A number of other interesting phenomena have been associated with this many-faced material in the literature. I will describe our current state of understanding of few layer WTe2 and our attempts to couple it to other 2D materials, including 2D magnets and graphene.
Host: Alex Levchenko
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