Münster 1997 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 32: Quantendots II
HL 32.8: Vortrag
Donnerstag, 20. März 1997, 17:15–17:30, H2
Tunneling through an impurity in a Luttinger liquid with an interaction potential of finite range — •M. Sassetti1, B. Kramer1, and G. Cuniberti2 — 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, D–20355 Hamburg — 2Dipartamento di Fisica, INFM, Università di Genova, Via Dodecaneso 33, I–16146
The non-linear transport through a tunnel barrier in a Luttinger system is investigated for repulsive electron-electron interaction of finite range [1]. Depending on whether the electrons are located on different or on the same sides of the barrier, the interaction strengths are assumed to be given by V12 and V11, respectively. The features of the Coulomb blockade are found in the current-voltage characteristics when the range of the interaction potential is non-zero, and if V12=0. In this limit, the parameters of the semiclassical theory of the Coulomb blockade, namely the tunneling resistance, the capacitance, and the impedance of the circuit are identified in terms of the microscopic parameters of the quantum mechanical model of the interacting electrons. If V12=V11 the current is still suppressed at small bias voltage but the charging energy vanishes. We demonstrate that the latter is a consequence of an exact sum rule. The results are discussed in the light of experimental findings.
[1] M. Sassetti, G. Cuniberti, B. Kramer, in press