The nonlinear Seebeck coefficient of an SU(N) Kondo impurity becomes coupling-asymmetry dependent through the quadratic voltage response, which can enhance thermopower in beyond-half-filled systems.
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Nonlinear Seebeck effect of SU($N$) Kondo impurity
The nonlinear Seebeck coefficient of an SU(N) Kondo impurity becomes coupling-asymmetry dependent through the quadratic voltage response, which can enhance thermopower in beyond-half-filled systems.