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Intermediate Electronic Phases: Between the Fermi Liquid and the Wigner Crystal

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Mueller Lecture by Steven Kivelson (Stanford University)
When
19 April 2007 from 4:00 PM to 5:00 PM
Where
117 Osmond Laboratory
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Long-range interactions, in particular Coulomb interactions, which are often neglected in statistical mechanics, can qualitatively affect the phase diagrams of strongly correlated systems. An example of this is a recently proven theorem concerning the absence of first order phase transitions in two dimensional systems with either Coulomb or dipolar interactions. One particularly interesting consequence of this theorem is that, at zero temperature (T=0) and in the absence of disorder, there must occur one or more intermediate density quantum phases of the two dimensional electron gas between the high density (Fermi) liquid and the low density (Wigner) crystal phases. Implications of the existence of these phases for real systems - at low, but non-zero T and with weak but non-vanishing disorder - will be discussed.

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