Thursday, February 5, 2009, 1:30 pm — Small Seminar Room, Bldg. 510
Wei Ku and Yucel Yildirim
After more than 2 decades of intensive studies, the superconductivity of high-Tc cuprates remains confusing to the community, to say the least. Especially in the heavily studied underdoped region, many phenomenonologies differ qualitatively from the conventional BCS descriptions. In this talk, we will present a very simple microscopic model of strong coupling limit of superconductivity in the underdoped cuprates where physics is evidently dominated by classical phase fluctuation.
Our theory explains 1) the origin of the d-wave symmetry (and its "irrelevance" to the general properties of superconductivity), 2) the long standing problem of small stiffness unexplained by Emery and Kivelson's phenomenonological picture of phase fluctuation, and 3) the nature of the quantum critical point around 5-6% doping, and 4) the observed 3D critical exponent vs. anisotropic quasi-2D penetration depth. Excellent agreement with several non-trivial experiments will be presented, together with a shocking prediction of incoherent p-wave symmetry below 5% doping. Some experimental confirmations will be proposed that can be conducted in BNL.
Hosted by: Myron Strongin
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