Enhanced spin-orbit scattering length in narrow Al_xGa_{1-x}N/GaN wires

Abstract

The magnetotransport in a set of identical parallel AlGaN/GaN quantum wire structures was investigated. The width of the wires was ranging between 1110 nm and 340 nm. For all sets of wires clear Shubnikov--de Haas oscillations are observed. We find that the electron concentration and mobility is approximately the same for all wires, confirming that the electron gas in the AlGaN/GaN heterostructure is not deteriorated by the fabrication procedure of the wire structures. For the wider quantum wires the weak antilocalization effect is clearly observed, indicating the presence of spin-orbit coupling. For narrow quantum wires with an effective electrical width below 250 nm the weak antilocalization effect is suppressed. By comparing the experimental data to a theoretical model for quasi one-dimensional structures we come to the conclusion that the spin-orbit scattering length is enhanced in narrow wires.

arXiv comment6 pages, 5 figures

References in corpus (10)

• Random-Matrix Theory of Quantum Transport
• Weak Antilocalization and Spin Precession in Quantum Wells
• Suppression of Spin Relaxation in Submicron InGaAs Wires
• Waveguide diffusion modes and slowdown of D'yakonov-Perel' spin relaxation in narrow 2-D semiconductor channels
• Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires
• The spin-orbit interaction as a source of new spectral and transport properties in quasi-one-dimensional systems
• Filtering spin with tunnel-coupled electron wave guides
• Large Bychkov-Rashba spin-orbit coupling in high-mobility GaN/AlGaN heterostructures
• Demonstration of Rashba spin splitting in GaN-based heterostructures
• Weak antilocalization and zero-field electron spin splitting in AlGaN/AlN/GaN heterostructures with a polarization induced two-dimensional electron gas

Cited by in corpus (10)

• Spin dynamics in semiconductors
• Antilocalization of Coulomb Blockade in a Ge-Si Nanowire
• Suppressed decay of a laterally confined persistent spin helix
• One-dimensional Weak Localization of Electrons in a Single InAs Nanowire
• Dimensional Dependence of Weak Localization Corrections and Spin Relaxation in Quantum Wires with Rashba Spin-Orbit Coupling
• Anisotropic Magneto-conductance of InAs Nanowire: Angle Dependent Suppression of 1D Weak Localization
• Direction Dependence of Spin Relaxation in Confined 2D Systems
• Anisotropic universal conductance fluctuations in disordered quantum wires with Rashba and Dresselhaus spin-orbit interaction and applied in-plane magnetic field
• Electron spin relaxation in n-type InAs quantum wires
• Ballistic spin resonance in multisubband quantum wires