Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 37: Quantenpunkte und -drähte: Transporteigenschaften

HL 37.6: Talk

Thursday, March 11, 2004, 11:30–11:45, H13

Fano and Kondo Resonances in Three-Leaded Quantum Dot Systems — •Armin C. Welker, David Quirion, Juergen Weis und Klaus v. Klitzing — Max-Planck-Institut fuer Festkoerperforschung, D -70569 Stuttgart, Heisenbergstr. 1, Germany

The spectral function or density of states of a quantum dot coupled to two leads can be investigated by weakly coupling a third lead to the quantum dot. For doing so, the differential conductance to this third lead is measured as a function of the bias voltage applied to this probing lead in reference of the two main leads. The feasibility of this approach for investigating the out-of-equilibrium splitting of the Kondo resonance has been theoretically explored [1]. We present our preliminary experimental results on a split-gate quantum dot indicating this splitting.

In addition, measurements on a quantum dot system are shown in the regime of strong coupling to the two main leads where Fano-like resonances occur. A peak in the differential conductance to the third lead is observed whenever a Fano-like resonance is obtained in the conductance between the two main leads. [1] E. Lebanon and A. Schiller, Phys. Rev. B 65, 035308 (2002).