Magnetoresistance and cyclotron mass in extremely-coupled double quantum wells under in-plane magnetic fields
The authors experimentally investigate the transport properties of an extremely-coupled AlGaAs/GaAs double quantum well, subject to in-plane magnetic fields (B{sub {parallel}}). The coupling of the double quantum well is sufficiently strong that the symmetric-antisymmetric energy gap ({Delta}{sub SAS}) is larger than the Fermi energy (E{sub F}). Thus for all B{sub {parallel}} only the lower energy branch of the dispersion curve is occupied. In contrast to systems with weaker coupling such that {Delta}{sub SAS} < E{sub F} the authors find: (1) only a single feature, a maximum, in the in-plane magnetoresistance, (2) a monotonic increase with B{sub {parallel}} in the cyclotron mass up to 2.2 times the bulk GaAs mass, and (3) an increasing Fermi surface orbit area with B{sub {parallel}}, in good agreement with theoretical predictions.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 554859
- Report Number(s):
- SAND--97-1264C; CONF-970947--; ON: DE98001332; BR: DP0102022
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetoresistance of One-Dimensional Subbands in Tunnel-Coupled Double Quantum Wires
Reduced radiative currents from GaAs/InGaAs and AlGaAs/GaAs p-i-n quantum well devices