Cumulants of heat transfer across nonlinear quantum systems

摘要: We consider thermal conduction across a general nonlinear phononic junction. Based on two-time observation protocol and the nonequilibrium Green’s function method, heat transfer in steady-state regimes is studied, practical formulas for calculation of cumulant generating are obtained. As an application, formalism used to study anharmonic effects fluctuation single-site junction with quartic on-site pinning potential. An explicit modification exact up first order given, which Gallavotti-Cohen symmetry found still valid. Numerically self-consistent procedure introduced, works well strong nonlinearity.