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Current noise in the vicinity of the 2D superconductor-insulator quantum critical point

Green, AG; Moore, JE; Sondhi, SL; Vishwanath, A; (2006) Current noise in the vicinity of the 2D superconductor-insulator quantum critical point. PHYS REV LETT , 97 (22) , Article 227003. 10.1103/PhysRevLett.97.227003. Green open access

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Abstract

Systems near to quantum critical points show universal scaling in response to external probes. We consider whether this scaling is reflected in their out-of-equilibrium fluctuations. We study current noise in the metallic state at the z=1 quantum critical point between a superconductor and an insulator in two dimensions. Using a Boltzmann-Langevin approach within a 1/N expansion, we show that the current noise obeys a universal scaling form S-j=T Phi[T/T-eff(E)], with T-eff proportional to root E. This treatment recovers Johnson noise in thermal equilibrium and S-j proportional to root E at strong electric fields. The latter differs significantly from both the shot noise in conventional metals (diffusive Fermi liquids) and the free carrier result, due to strong correlations between the critical bosonic excitations. Current-noise measurements could therefore help clarify the physics of the destruction of superconductivity in thin film superconductors.

Type: Article
Title: Current noise in the vicinity of the 2D superconductor-insulator quantum critical point
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.97.227003
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.97.227003
Language: English
Additional information: © 2006 The American Physical Society
Keywords: FLUCTUATIONS, TRANSITION
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/1333477
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