Condensed Matter Seminars

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Meeting ID: 775-042-517

Tuesday, April 14, 2020
2:00 PM
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"Atomic and Electronic Correlations in the Change Density Wave phase of Dichalcogenides"

Sharon Philip , University of Virginia - Department of Physics
[Host: Despina Louca]

Studies on transition metal dichalcogenides (TMD) is of great significance due to their interesting topological properties and remarkable electronic behavior. Among these materials,1T- TaX2 class of TMDs, where X = S, Se, has spurred considerable interest due to their multiple first order phase transitions between different charge density wave (CDW) states. The effects of CDW formation in these compounds are attributed primarily to in-plane re-orientation of Ta atoms to Star-of-David formation. But this alone doesn’t explain the notable electronic behavior of 1T-TaS2 and 1T-TaSe2 and why they differ from one another despite having the same trigonal symmetry. At very low temperatures, 1T-TaS2 undergoes a metal - insulator transition and is proposed to harbor a quantum spin liquid behavior whereas 1T-TaSe2 remains metallic. Investigating the local structure of pristine 1T-TaS2 and 1T-TaSe2 in the CDW regime could tell us the differences in local atomic correlations in these compounds.

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