Dynamical Conductivity at the Dirty Superconductor-Metal Quantum Phase Transition

Autor(es)

Del Maestro, Adrian ^[1] ; Rosenow, Bernd ^[2] ; Hoyos, Jose A. ^[3] ; Vojta, Thomas ^[4]

Afiliação do(s) autor(es)

^[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1 - Canada

^[2] Univ Leipzig, Inst Theoret Phys, D-04103 Leipzig - Germany

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Paulo - Brazil

^[4] Missouri Univ Sci & Technol, Dept Phys, Rolla, MO 65409 - USA

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 105, n. 14 OCT 1 2010.
• Citações Web of Science: 12

Resumo

We study the transport properties of ultrathin disordered nanowires in the neighborhood of the superconductor-metal quantum phase transition. To this end we combine numerical calculations with analytical strong-disorder renormalization group results. The quantum critical conductivity at zero temperature diverges logarithmically as a function of frequency. In the metallic phase, it obeys activated scaling associated with an infinite-randomness quantum critical point. We extend the scaling theory to higher dimensions and discuss implications for experiments. (AU)

• Processo FAPESP: 10/03749-4 - Transições de fase quânticas: efeitos de desordem e dissipação
• Beneficiário: José Abel Hoyos Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular