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.
In case of the SU( N) systems with m electrons satisfy- ing the specific combination such that m/N=(2n + 1)/4 for n = 0 and 1, the cosine factor cos 2δ0 in Eq
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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.