High-Density GaAs/AlAs Quantum Wires Grown on (775)B-Oriented GaAs Substrates by Molecular Beam Epitaxy

2010

The density of states and the conductivity tensor of a quantum-wire array with disorder in the period, direction, and height of the corrugation are calculated in magnetic fields within a self-consistent Born approximation. A diffuse Bragg scattering causes pseudo-Landau-levels associated with the second band and pseudo-open-orbits in the gap region of a corresponding system without disorder. This fact manifests itself as various characteristic structures in the density of states, the conductivity in the direction parallel and perpendicular to the wire, and the Hall conductivity.

Section: Introductionmentioning

confidence: 99%

Pseudo-Band-Structure of Disordered Lateral Superlattice in Magnetic Field

2010

“…[1][2][3][4] This was made by the growth of a corrugated GaAs quantum well with a zigzag shape on top of a flat AlAs surface and covered by an AlAs barrier layer. Actually, the zigzag corrugations have some fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, the zigzag corrugations have some fluctuations. 1,2) The purpose of this paper is to theoretically explore the influence of such strongly modulated two-dimensional systems on the dynamical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Dynamical Conductivity in Disordered Quantum Wire Array

2007

“…[1][2][3][4] This was achieved by the growth of a corrugated GaAs quantum well with a zigzag shape on top of a flat AlAs surface and covered by an AlAs barrier layer. Actually, zigzag corrugations have some fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…Actually, zigzag corrugations have some fluctuations. 1,2) The purpose of this paper is to theoretically explore the transport of such strongly modulated twodimensional systems with some disorder in the period.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Band-Structure in a Disordered Quantum Wire Array

2005

Transport properties of quantum-wire arrays with disorder in the period are studied theoretically within a self-consistent Born approximation. Although no band gap opens to the lowest order because of the flat average potential, a pseudo-band-structure is recovered in higher order due to effects of strong diffuse Bragg scattering as long as the disorder remains small. A pseudo-band-gap manifests itself in the density of states, the spectral function, and the anisotropic conductivities, and modifies the conductivity in the quantum-wire direction qualitatively in the vicinity of the zone boundary.