The magnetic field tuned superconductor (metal) to insulator transition

Event Dates: 

Thursday, March 19, 2015 - 12:00pm

CTQM Seminar Type: 

  • Related Seminar Series

Speaker Name(s): 

Aharon Kapitulnik

Speaker Affiliation(s): 

Stanford University

Abstract, Event Details: 

While the classical theory of phase transitions has been extraordinarily successful, there are several reasons to exercise caution when applying this approach to the zero temperature superconducting transition. First, experimental identification of the relevant phases requires extrapolation to zero temperature, which becomes complicated, especially when one needs to identify sources of dissipation. In addition, since superconductivity may be highly inhomogeneous as appreciable superconducting order parameter may be concentrated in “superconducting puddles” due to disorder and/or spontaneous phase separation, the nature of the quantum phase transition to a superconducting state may be highly anomalous, where the system attempts to optimizes  the formation of puddles with the Josephson coupling among them to obtain global superconductivity.  In this talk we will review some of the consequences of these considerations, emphasizing the limit where a true superconductor to Bose insulator transition is observed and the limit where anomalous metallic phases near the SIT emerge.