Condensed Matter Physics Seminar
Friday, March 12, 1999, 2 p.m.
Plant Sciences Building, Room 1130
Pseudogap state and order parameter phase fluctuations in underdoped cuprates
Hyok-Jon Kwon
(Department of Physics, University of Florida, Gainesville)
Abstract: I discuss the role of order parameter phase fluctuations
in the pseudogap phase of underdoped cuprates. The pseudogap state may
be viewed as a superconductor where the phase coherence is destroyed by
thermal phase fluctuations. I present a phenomenological low-energy theory
to incorporate the fermion-phase field coupling in a two-dimensional superconductor
and show the effects of vortex pair unbinding transition on fermion single-particle
properties and the specific heat. I also discuss the possible zero-temperature
analog of the pseudogap state where the quasiparticle fermions possess
a d-wave gap. I show that a characteristic antiferromagnetic quantum phase
transition may exist and is governed by long-ranged interaction induced
by the gapless nodal quasiparticles.
Host: Victor Yakovenko
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