1D Bragg reflector in the Tomonaga-Luttinger liquid regime and Fermi liquid regimes

Employing an array of shallow etched trenches aligned transverse to current flow. we have fabricated long (1-2 mum) split-gate quantum wires with weak periodic potential modulation on a GaAs/AlGaAs 2DEG wafer, thereby realizing a 1D Bragg reflector at a very low temperature. In the presence of the first and second edge states, i.e. in the Fermi liquid regime, we observe two groups of conductance dips due to the spin-separate reflection resonances. On the other hand, in the weak magnetic field range. we observe a dip of conductance with temperature as a signature of the Tomonaga-Luttinger liquid effects. (C) 2002 Elsevier Science B.V. All rights reserved.