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Kondo signature in heat transfer via a local two-state system

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arxiv 1307.7426 v3 pith:KE7XYEB6 submitted 2013-07-29 cond-mat.stat-mech cond-mat.mes-hall

Kondo signature in heat transfer via a local two-state system

classification cond-mat.stat-mech cond-mat.mes-hall
keywords kondoconductancekappasystemtemperaturealphacouplinghbar
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We study the Kondo effect in heat transport via a local two-state system. This system is described by the spin-boson Hamiltonian with Ohmic dissipation, which can be mapped onto the Kondo model with anisotropic exchange coupling. We calculate thermal conductance by the Monte Carlo method based on the exact formula. Thermal conductance has a scaling form \kappa = (k_B^2 T_K/\hbar) f(\alpha,T/T_K ), where T_K and \alpha indicate the Kondo temperature and dimensionless coupling strength, respectively. Temperature dependence of conductance is classified by the Kondo temperature as \kappa\propto (T/T_K )^3 for T\ll T_K and \kappa\propto (k_B T / \hbar\omega_c)^{2\alpha-1} for T\gg T_K. Similarities to the Kondo signature in electric transport are discussed.

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