Multisublevel Magnetoquantum Conductance in Single and Coupled Double Quantum Wires
- Sandia National Laboratories
We study the ballistic and diffusive magnetoquantum transport using a typical quantum point contact geometry for single and tunnel-coupled double wires that are wide (less than or similar to1 mum) in one perpendicular direction with densely populated sublevels and extremely confined in the other perpendicular (i.e., growth) direction. A general analytic solution to the Boltzmann equation is presented for multisublevel elastic scattering at low temperatures. The solution is employed to study interesting magnetic-field dependent behavior of the conductance such as a large enhancement and quantum oscillations of the conductance for various structures and field orientations. These phenomena originate from the following field-induced properties: magnetic confinement, displacement of the initial- and final-state wave functions for scattering, variation of the Fermi velocities, mass enhancement, depopulation of the sublevels and anticrossing (in double quantum wires). The magnetoconductance is strikingly different in long diffusive (or rough. dirty) wires from the quantized conductance in short ballistic (or clean) wires. Numerical results obtained for the rectangular confinement potentials in the growth direction are satisfactorily interpreted in terms of the analytic solutions based on harmonic confinement potentials. Some of the predicted features of the field-dependent diffusive and quantized conductances are consistent with recent data from GaAs/AlxGa1-xAs double quantum wires.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 793342
- Report Number(s):
- SAND2001-0383J
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 64; ISSN 1095-3795
- Publisher:
- PR/PRL, One Research Road, Box 9000, Ridge, NY 11961-9000
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic Anticrossing of 1D Subbands in Coupled Ballistic Double Quantum Wires
Magnetoconductance of Independently Tunable Tunnel-Coupled Double Quantum Wires
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOLTZMANN EQUATION
CONFINEMENT
ELASTIC SCATTERING
GEOMETRY
HARMONICS
INPLANE MAGNETIC-FIELDS
MAGNETIC CONFINEMENT
MAGNETORESISTANCE
OSCILLATIONS
QUANTIZED CONDUCTANCE
RESISTANCE
SCATTERING
SUBBANDS
TRANSPORT
WAVE FUNCTIONS
WELLS