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Condensed Matter Seminars
| Condensed Matter
Thursday, February 1, 2007
Physics Building, Room 204
Note special time.
Note special room.
[Host: Paul Fendley]
" Mutual influence of vortices and quasiparticles in d-wave superconductors "
Vortices in clean d-wave superconductors at low temperatures can
as quantum particles. Their quantum dynamics is made possible by the
smallness of their cores, due to short coherence length in typical
cuprates, and by the presence of massless fermionic quasiparticles,
which give rise to certain universal effects. We calculate a small
finite renormalization of vortex mass by the nodal quasiparticles,
demonstrate the absence of Bardeen-Stephen damping of vortex motion
the limits of zero temperature, no disorder and vanishing core size.
Being liberated from strong friction, light vortices can experience
significant quantum fluctuations that can explain several phenomena
observed in cuprates, including the Nernst effect and density waves.
also show that quantum fluctuations of localized vortices can
significantly affect quasiparticle spectra. The local electronic
of states (LDOS) near a quantum fluctuating vortex shows no
peak, but has satellite features at energies set by the vortex
potential. These are proposed to be the origin of the sub-gap LDOS
observed in recent STM experiments near the vortex cores.
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