TY - JOUR
T1 - Size-effects and tuning of phase coherence in a double quantum well mesoscopic wire
AU - Gompertz, MJ
AU - Ihn, Thomas
AU - main, pc
AU - Nogaret, Alain
AU - Eaves, L
AU - Henini, M
AU - beaumont, sp
PY - 1998/6/17
Y1 - 1998/6/17
N2 - We have investigated the magnetoresistance properties of mesoscopic wires fabricated from a modulation-doped GaAs/(AlGa)As double quantum well structure containing two coupled 2D electron gases (2DEGs). An in-plane magnetic field, B, “tunes” the tunnelling between the 2DEGs and, in a Hall bar device, leads to a resistance feature at B≈10T due to a van Hove singularity in the density of states. In mesoscopic wires this feature becomes a strong resistance peak. We attribute this enhancement to a size effect. In addition, we observe universal conductance fluctuations with the in-plane B. These disappear when B is strong enough to suppress the tunnelling between the wells.
AB - We have investigated the magnetoresistance properties of mesoscopic wires fabricated from a modulation-doped GaAs/(AlGa)As double quantum well structure containing two coupled 2D electron gases (2DEGs). An in-plane magnetic field, B, “tunes” the tunnelling between the 2DEGs and, in a Hall bar device, leads to a resistance feature at B≈10T due to a van Hove singularity in the density of states. In mesoscopic wires this feature becomes a strong resistance peak. We attribute this enhancement to a size effect. In addition, we observe universal conductance fluctuations with the in-plane B. These disappear when B is strong enough to suppress the tunnelling between the wells.
U2 - 10.1016/S0921-4526(98)00090-8
DO - 10.1016/S0921-4526(98)00090-8
M3 - Article
VL - 249 - 251
SP - 162
EP - 165
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -