Hamburg 2001 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 12: Quantenpunkte und -dr
ähte: Transporteigenschaften I
HL 12.10: Vortrag
Montag, 26. März 2001, 17:45–18:00, S9/10
Transport in quantum wires with impurities at finite temperature — •Tobias Kleimann1, Maura Sassetti1, and Bernhard Kramer2 — 1Dipartimento di Fisica, INFM, Via Dodecaneso 33, I-16146 Genova — 2I. Inst. Theor. Physik, Universität Hamburg, Jungiusstr. 9, D-20355 Hamburg
The effect of interactions in the transport properties of one-dimensional quantum dots formed by two impurities in GaAs-AlGaAs quantum wires can be investigated experimentally [1]. These studies show puzzling features in the conductance and spectrum to be interpreted [2]. We propose an inhomogenous interaction strength along the wire describing the experimental setup. By calculating the one particle Greens function we extract the effective Luttinger liquid exponents for the conductance [3] and find that power laws depend on the temperature range and the positions of the impurities with respect to the interaction landscape.
[1] O. M. Auslaender et al., Phys. Rev. Lett. 84, 1764 (2000)
[2] T. Kleimann et al., Phys. Rev. B 62, 8144 (2000)
[3] A. Furusaki and N. Nagaosa, Phys. Rev. B 54, R5239 (1996)