Transport properties of a spinon Fermi surface coupled to a U(1) gauge field

Cody P. Nave and Patrick A. Lee
Phys. Rev. B 76, 235124 – Published 21 December 2007

Abstract

With the organic compound κ(BEDTTTF)2Cu2(CN)3 in mind, we consider a spin liquid system where a spinon Fermi surface is coupled to a U(1) gauge field. Using the nonequilibrium Green’s function formalism, we derive the quantum Boltzmann equation for this system. In this system, however, one cannot a priori assume the existence of Landau quasiparticles. We show that even without this assumption, one can still derive a linearized equation for a generalized distribution function. We show that the divergence of the effective mass and of the finite temperature self-energy do not enter these transport coefficients and thus they are well defined. Moreover, using a variational method, we calculate the temperature dependence of the spin resistivity and thermal conductivity of this system.

  • Received 5 September 2007

DOI:https://doi.org/10.1103/PhysRevB.76.235124

©2007 American Physical Society

Authors & Affiliations

Cody P. Nave* and Patrick A. Lee

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • *Present address: Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA.

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Issue

Vol. 76, Iss. 23 — 15 December 2007

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