Effects of Coulomb interaction on photon-assisted current noises through a quantum dot

Abstract

We study photon-assisted transport in a single-level quantum dot system under a periodically oscillating field. Photon-assisted current noises in the presence of the Coulomb interaction are calculated based on a gauge-invariant formulation of time-dependent transport. We derive the vertex corrections within the self-consistent Hartree-Fock approximation in terms the Floquet-Green's functions (Floquet-GFs), and examine the effects of the Coulomb interaction on the photon-assisted current noises. Moreover, we introduce a concept of an effective temperature to characterize nonequilibrium properties under the influence of the AC field. The vertex corrections are suppressed by the rise of the effective temperature, whereas characteristic resonant structures appear in the frequency spectra of the vertex corrections. The present result provides a useful viewpoint for understanding photon-assisted transport in interacting electron systems.

13 pages, 10 figures

References in corpus (6)

• Driven quantum transport on the nanoscale
• An On-Demand Coherent Single Electron Source
• Coherence and Indistinguishability of Single Electrons Emitted by Independent Sources
• Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism
• Shot noise of a mesoscopic two-particle collider
• Dynamics of Quantum Noise in a Tunnel Junction under ac Excitation

Cited by in corpus (2)

• Functional renormalization group in Floquet space
• Spin-orbit interaction induces charge beatings in a lightwave-STM single molecule junction