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Lecture F.M. Marchetti


11 December 2003 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. F.M. Marchetti
Affiliation:Cavendish Laboratory, Cambridge, UK
Title:Critical correlations in disordered superconducting thin films
Date:Thu Dec 11, 2003
Location:FWN-Building 5114.0004
Host:M. Mostovoy
Telephone:+31 50 363 4957


When applied to a disordered superconducting thin film, a parallel magnetic field affects a mechanism of pair breaking and leads to the gradual destruction of superconductivity. The field driven quantum phase transition between the superconducting and metallic states is characterised by the spectral properties of the complex superconducting pairing susceptibility, which, in presence of disorder, is a random operator. While disorder remains weak, (mesoscopic) fluctuations of the susceptibility are typically much smaller than its average, and their effect can be largely neglected. However, near the transition, the macroscopic properties of the system can be dominated by fluctuations. Here, we argue that the quantum phase transition to the ordered state is preempted by the formation of a phase, in which the complex superconducting order parameter exhibits quenched, long-ranged, fractal-like correlations.We suggest that such behaviour may be a generic feature of quantum critical phenomena in disordered environments.


Last modified:22 October 2012 2.30 p.m.