Universal nonlinear conductivity close to an itinerant-electron quantum critical point

P. M. Hogan, A. G. Green

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We study the conductivity in itinerant-electron systems near to a magnetic quantum critical point. We show that, for a class of geometries, the universal power-law dependence of resistivity upon temperature may be reflected in a universal nonlinear conductivity; when a strong electric field is applied, the resulting current has a universal power-law dependence upon the applied electric field. For a system with thermal-equilibrium current proportional to T-alpha and dynamical exponent z, we find a nonlinear resistivity proportional to E(z-1)/[z(1+alpha)-1].

Original languageEnglish
Article number195104
Number of pages13
JournalPhysical Review. B, Condensed matter and materials physics
Volume78
Issue number19
DOIs
Publication statusPublished - 7 Nov 2008

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