Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 106: Transport, magnetotransport and quantum Hall physics

HL 106.11: Talk

Friday, March 20, 2015, 12:45–13:00, EW 202

Current noises through a quantum dot in the presence of an oscillating gate voltage — •takafumi suzuki and takeo kato — Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan

We study photon-assisted transport in a quantum dot system under a periodically oscillating gate voltage. 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 an explicit expression of the vertex corrections within the self-consistent Hartree-Fock approximation in terms the Floquet-Green’s functions. Moreover, we introduce 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.