Nonlinear Transport Near a Quantum Phase Transition in Two Dimensions

Details Nonlinear Transport Near a Quantum Phase Transition in Two Dimensions Nonlinear Transport Near a Quantum Phase Transition in Two Dimensions

2003-10-06

arxiv.org/abs/cond-mat/0310129v1

Phys. Rev. Lett. vol. 93, 27004-1 (2004).

Physics

Condensed Matter

Superconductivity

4.15 pages, no figures

Scientific paper

10.1103/PhysRevLett.93.027004

The problem of non-linear transport near a quantum phase transition is solved within the Landau theory for the dissipative insulator-superconductor phase transition in two dimensions. Using the non-equilibrium Schwinger round-trip Green function formalism, we obtain the scaling function for the non-linear conductivity in the quantum disordered regime. We find that the conductivity scales as $E^2$ at low field but crosses over at large fields to a universal constant on the order of $e^2/h$. The crossover between these two regimes obtains when the length scale for the quantum fluctuations becomes comparable to that of the electric field within logarithmic accuracy.

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