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Condensed Matter Seminars
| Condensed Matter
Thursday, February 10, 2005
Physics Building, Room 204
Note special time.
Note special room.
[Host: Paul Fendley]
"Vortex Dynamics and Fluctuations Near the Magnetic Field Tuned Superconductor-Insulator Transition"
Superconductivity in two dimensions provides a unique area in which a fascinating variety of novel and fundamental phenomena occur. In this
talk, I will review recent theoretical and experimental results on disordered films, which undergo a magnetic field tuned superconducting-insulator transition at low temperatures. I will focus on the unusual phases and fluctuation phenomena evident in the experimental studies of the field-tuned transition. First, I will explain how rare disorder fluctuations can enhance global
superconductivity and increase the critical magnetic field at which samples become superconducting. Next, I will briefly summarize the recently developed theory of quantum superconducting fluctuations, which explains transport properties above the transition. At the end of my talk, I will focus on the low-temperature metallic phase observed in certain materials. This metallic state is truly mysterious
and can not be explained by any conventional theory (involving bosonic vortices as basic excitations). I will argue that under certain
circumstances the statistics of the vortices can change from bosonic to fermionic. Such a statistical transmutation may explain the nature
of the metallic state. I will discuss possible experimental signatures of the resulting vortex Fermi liquid.
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