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Condensed Matter Seminars
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 quantummechanical.
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.




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