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HL: Halbleiterphysik
HL 6: Hauptvortrag
HL 6.1: Invited Talk
Monday, March 27, 2000, 15:00–15:45, H15
Quantum wires as Luttinger liquids: experiment — •Werner Wegscheider1, Martin Rother2, Rainer Deutschmann2, Max Bichler2, and Gerhard Abstreiter2 — 1Institut für Angewandte und Experimentelle Physik, Universität Regensburg, 93040 Regensburg — 2Walter Schottky Institut, Technische Universität München, Am Coulombwall, 86748 Garching
The low-temperature ballistic transport properties
of quantum wires prepared by the cleaved edge overgrowth
method in the GaAs/AlGaAs material system are presented.
As the Fermi energy in these one-dimensional (1D) systems is varied
by application of a gate voltage a series of quantized
conductance plateaus is observed. The plateau values
significantly deviate from integer multiples of 2 · e2/h
and show a power law increase with increasing temperature as
predicted by Luttinger liquid (LL) theory. The characteristic
power law scaling exponent is obtained as a function of the
Fermi energy and the number of occupied 1D subbands. From
nonlinear current-voltage characteristics across the quantum
wires independent LL power law scaling exponents can be deduced. The latter
are found to be consistent with those obtained from temperature
dependent measurements.