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LASSP Special Seminar: Xiaochuan Wu, University of California, Santa Barbara

Thursday, December 2, 2021 at 12:20pm to 1:20pm

Virtual Event

Title: A construction of exotic metal and metal-insulator transition

AbstractThe charge resistivity/conductivity can take universal values in various scenarios of two-dimensional condensed matter systems. Well-known examples of universal resistivity include 2+1d quantum critical points, (fractional) quantum Hall effects, a criterion of two-dimensional “bad metal”, and the universal resistivity jump predicted at the interaction-driven metal-insulator transition. We construct examples of two-dimensional metallic states with the following exotic behaviors: (1) at low temperature this state is a “bad metal” whose resistivity can be much larger than the Mott-Ioffe-Regel limit; (2) while increasing temperature T the resistivity ρ(T) crosses over from a bad metal at low T to a good metal at intermediate T; (3) at low temperature the metallic state has a large Lorenz number, which strongly violates the Wiedemann-Franz law; (4) the state also has a large thermopower (Seebeck coefficient). Motivated by the recent experiment in transition metal dichalcogenides, an exotic interaction-driven metal-insulator transition will also be constructed. The universal resistivity jump at this transition far exceeds what was proposed in previous theory.

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Topic: Xiaochuan Wu Bethe/Wilkins/KIC Seminar Presentation

Time: Dec 2, 2021 12:20 PM Eastern Time (US and Canada)

 

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Meeting ID: 934 4342 7386

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Event Type

Seminar

Departments

LASSP, Physics

University Themes

Research

Tags

cascal, physics, lassp, quantum_site

Website

http://lassp.cornell.edu

Hashtag

#physics

Contact E-Mail

tdm68@cornell.edu

Contact Name

Trisica D Munroe

Contact Phone

5-2324

Speaker

Xiaochuan Wu

Speaker Affiliation

University of California, Santa Barbara

Dept. Web Site

https://lassp.cornell.edu

Open To

Cornell community

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