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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Correlated Electrons: Quantum-Critical Phenomena 2

TT 22.11: Talk

Wednesday, March 25, 2009, 12:30–12:45, HSZ 03

Infinite randomness fixed point of the superconductor-metal quantum phase transition — •Bernd Rosenow1, Adrian Del Maestro2, Markus Mueller3, and Subir Sachdev41Max-Planck Institut für Festkörperforschung, D-70569 Stuttgart, Germany — 2University of British Columbia , Vancouver, BC V6T1Z1, Canada — 3University of Geneva, 1211 Geneva, Switzerland — 4Harvard University, Cambridge, MA 02138, USA

We examine the influence of quenched disorder on the superconductor-metal transition, as described by a theory of overdamped Cooper pairs which repel each other. The self-consistent pairing eigenmodes of a quasi-one dimensional wire are determined numerically. Our results [1] support the recent proposal [2] that the transition is characterized by the same strong disorder fixed point describing the onset of ferromagnetism in the random quantum Ising chain in a transverse field.

[1] A. Del Maestro, B. Rosenow, M. Müller, and S. Sachdev, Phys. Rev. Lett. 101, 035701 (2008).

[2] J. A. Hoyos, C. Kotabage, and T. Vojta, Phys. Rev. Lett. 99, 230601 (2007).

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