Seminars & Lectures
| * TITLE | Understanding Electronic Nematic Phase in Interacting Systems | ||||||
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| * HOST(Applicant) | |||||||
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| * DATE / TIME | 2004-05-07, 9:00 am | ||||||
| * PLACE | Bldg 3, Room#103, POSTECH | ||||||
| * ABSTRACT | |||||||
| The existence of novel inhomogeneous and/or anisotropic quantum ground states in various electronic systems have been demonstrated by remarkable experiments on a number of different systems, in the last few years. I will review the phenomena of inhomogeneous spin and charge ordering observed in complex materials. I will show a microscopic theory of the electronic nematic Fermi liquid where the system of interacting fermions spontaneously breaks a point-group symmetry. The mean field analysis on two dimensional square lattice reveals that, as a function of interaction strength and chemical potential, the phase transition between the isotropic Fermi liquid and nematic phase is first order at zero temperature, and becomes second order at a finite temperature. The transition takes place for an arbitrarily small interaction at the van Hove band filling. In connection with the formation of the nematic phase, I will discuss competition between other broken symmetry states as well as the fate of the Lifshitz transition. |
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