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PGI Colloquium:

Prof. Dr. James Freericks,
Georgetown University, Washington, D.C., USA
 

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

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30 Nov 2018 11:00

How Do We Know When Hot Electrons Are Thermal?

FreericksCopyright: Prof. Dr. Freericks

Recent work in nonequilibrium dynamical mean-field theory has shed new light onto the criteria for thermalization, how nonequilibrium systems approach equilibrium, and the effects of strong electron correlation on the thermalization process.

I will describe recent work on how electrons thermalize after they are excited by an intense laser pulse and probed on different time scales via time-resolved angle-resolved photoemission spectroscopy. I will examine a number of different scattering mechanisms and the coupling to infinite and finite phonon baths. In particular, I will show why a hot electron spectra which is close to a Fermi-Dirac distribution is insufficient to determine whether the electrons have thermalized.

If time permits, I will also discuss some recent work on time-resolved electronic Raman scattering, which provides complimentary information to time-resolved angle-resolved photoemission spectroscopy.

Contact

Dr. Theodoulos Costi
Phone: +49 2461 61-4246
Fax: +49 2461 61-2620
email: t.costi@fz-juelich.de

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