Temporal evolution of Seebeck coefficient in an ac driven strongly correlated quantum dot

Abstract

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.

6 pages, 5 figures; to appear in Journal of Physics: Condensed Matter

References in corpus (9)

• Single-shot read-out of an individual electron spin in a quantum dot
• An On-Demand Coherent Single Electron Source
• Thermoelectric transport through strongly correlated quantum dots
• Tuning the Kondo effect with a mechanically controllable break junction
• Non adiabatic features of electron pumping through a quantum dot in the Kondo regime
• Periodic Field Emission from an Isolated Nano-Scale Electron Island
• Kondo Shuttling in Nanoelectromechanical Single-Electron Transistor
• Kondo resonance in an ac driven quantum dot subjected to finite bias
• Transient thermoelectricity in a vibrating quantum dot in Kondo regime

Cited by in corpus (3)

• A many-body approach to transport in quantum systems: From the transient regime to the stationary state
• Enhanced performance of a quantum-dot-based nanomotor due to Coulomb interactions
• Mixed electrical-heat noise spectrum in a quantum dot