Cornell University

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LASSP & AEP Seminar by Feng Wang (UC Berkeley)

Tuesday, May 2, 2023 at 12:20pm

Clark Hall, 700 142 Sciences Drive

Feng Wang 

Probing hydrodynamic electrodynamics and energy wave of Dirac fluid in graphene

Graphene, a single layer of carbon atoms, exhibits novel two-dimensional electronic behavior characterized by massless Dirac electrons. Close to the charge neutral points, thermally excited electrons and holes form a novel Dirac liquid with elementary excitations distinctly from a Fermi liquid.  Using an on-chip terahertz spectroscopy, we directly probe the unusual electrodynamic behavior of massless Dirac liquid in ultraclean graphene encapsulated in boron nitride. We reveal a quantum critical behavior in electron-electron scattering rate characteristic of a hydrodynamic description of the Dirac liquid. In addition, we visualize for the first the propagation of an energy wave, also known as the electronic second sound, of the Dirac fluid in graphene.

Feng Wang received a B.A. from Fudan University, Shanghai, in 1999 and a Ph.D. from Columbia University in 2004. From 2005-2007, he has been a Miller Fellow with Miller Institute for Basic Science at Berkeley. He joined the physics faculty at Berkely in fall, 2007.

Faculty Hosts: Jie Shan and Kin-Fai Mak

Pizza served starting at 12:10 p.m.

Please bring your own beverage.

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Dr. Feng Wang

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University of California Berkeley

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