  We study the response of the thermopower of a quantum dot in the Kondo regime
to sinusoidal displacement of the dot energy level via a gate voltage using
time dependent non-crossing approximation and linear response Onsager
relations. Instantaneous thermopower begins to exhibit complex fluctuations
when the driving amplitude is increased at constant driving frequency. We also
find that the time averaged thermopower decreases steadily until it saturates
at constant driving amplitude as a function of inverse driving frequency. On
the other hand, time averaged thermopower is found to be quite sensitive to
ambient temperature at all driving frequencies for large driving amplitudes. We
discuss the underlying microscopic mechanism for these peculiarities based on
the behaviour of the dot density of states.
