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

Abstract

With the organic compound $\kappa$-(BEDT-TTF)${}_2$-Cu${}_2$(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 non-equilibrium Green's function formalism, we derive the Quantum Boltzmann Equation (QBE) 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.

arXiv comment12 pages

References in corpus (8)

• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in κ-(ET)_2 Cu_2 (CN)_3
• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Slave-rotor mean field theories of strongly correlated systems and the Mott transition in finite dimensions
• Low Energy Dynamics of the Spinon-Gauge System
• Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to $\kappa -(BEDT-TTF{)}_{2}C{u}_2(CN{)}_3$
• Quantum Boltzmann equation of composite fermions interacting with a gauge field
• Susceptibility of a spinon Fermi surface coupled to a U(1) gauge field

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