Regensburg 2004 – wissenschaftliches Programm
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SYSN: Quantum Shot Noise in Nanostructures
SYSN 2: Quantum Shot Noise in Nanostructures
SYSN 2.4: Vortrag
Montag, 8. März 2004, 17:15–17:30, H1
Shot noise of coherent tunneling through Coulomb interacting quantum dots — •G. Kießlich, A. Wacker, and E. Schöll — Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, 10623 Berlin
The spectral power density of the tunneling current through quantum dots can help to clarify the transition from sequential (particlelike) to coherent (wavelike) mesoscopic transport. In the high temperature limit kBT≫Γ (Γ is the linewidth of the resonant quantum dot level) the noise and the current are well described by sequential tunneling using a Pauli master equation approach [1] which is in good agreement with experimental data [2]. For intermediate temperatures kBT≃Γ we derive the noise behavior starting from the Anderson Hamiltonian using a nonequilibrium Green’s function technique. In this framework we treat the tunneling coupling to the reservoirs exactly, and the Coulomb interaction in the quantum dot is included perturbatively beyond the Hartree approximation. The effect of Coulomb repulsion on the bias dependence of the noise in the sequential and coherent regime will be shown in detail.
[1] G. Kießlich, A. Wacker, and E. Schöll, Phys. Rev. B 68, 125320 (2003)
[2] G. Kießlich, A. Wacker, E. Schöll, A. Nauen, F. Hohls, and R.J. Haug, Phys. Status Solidi C 0, 1293 (2003)