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Condensed Matter Seminars

ics Condensed Matter
Thursday, September 28, 2006
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Qimiao Si [Host: Jongsoo Yoon]
Rice University
"Quantum Criticality"
ABSTRACT:
Quantum criticality describes the strong fluctuations of a second order phase transition at zero temperature. There is growing evidence that it is relevant to a large part of the phase diagram of a variety of strongly correlated materials. In this talk, I will describe some of the basic issues that challenge the theoretical description of quantum criticality. I will go on to make the case for a new class of quantum critical point, with critical fluctuations that are genuinely quantum-mechanical. In the case of heavy fermion metals, the theory of local quantum criticality characterizes such quantum fluctuations in terms of the collapse of a Kondo entanglement scale. Finally, I will summarize some of the experimental evidences for this theory, particularly those concerning the evolution of the Fermi surface.

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Condensed Matter Seminars), date, name of the speaker, title of talk, and an abstract (if available).