Condensed Matter Physics Seminar

2 p.m., Thursday, October 14, 2004
Room 1201, Physics Building

 Bose Metal

Philip Phillips

(University of Illinois at Urbana-Champaign)

Abstract:  Bosons are thought to exist in two quite distinct ground states: 1) localized in a Mott insulator or 2) condensed in a superconductor. However, recent experiments point to a third intriguing possibility: a metal with a finite resistivity at zero temperature. The Bose metallic phase appears to be quite robust and is observed in a wide variety of thin films which should nominally exihibit only insulating or superconducting phases. I will review the standard theoretical framework used to understand the insulator-superconductor transition, the recent experimental results and I will show quite generally how bosons in the presence of disorder can form a metallic state. The metallic state is rather weird, however. The phase degrees of freedom are glassy and it is the low-lying degrees of freedom in the glassy state that mediate the metallic state.
Host:  Chris Lobb
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