Seminars & Lectures
| * TITLE | Dynamical mean field theory and superconductivity: application to the Gutzwiller-projected BCS Hamiltonian | ||||||
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| * SPEAKERS | |||||||
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| * HOST(Applicant) | |||||||
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| * DATE / TIME | 2007-03-31, 9:00 – 9:50a.m. | ||||||
| * PLACE | Rm # 1423, 4th floor, KIAS | ||||||
| * ABSTRACT | |||||||
| One of the most prominent problems in high temperature superconductivity is the nature of the pseudogap phase in underdoped regimes; particularly important is its relationship to phase fluctuation. The Gutzwiller-projected BCS Hamiltonian is a useful model suited for the study of high temperature superconductivity especially in underdoped and optimally doped regimes due to exact mapping to the Heisenberg model at half filling and generally a very close connection to the t-J model at low and moderate doping. We develop the dynamical mean field theory of the d-wave BCS Hamiltonian with on-site repulsive interaction, U, which plays a role of physically imposing the Gutzwiller projection. The large U limit corresponds to the fully Gutzwiller-projected BCS Hamiltonian. Effects of the phase fluctuation are studied as a function of on-site repulsion, U, and hole concentration, x. | |||||||
