Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-03-30
Phys. Rev. B 84, 085307 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 7 figures
Scientific paper
10.1103/PhysRevB.84.085307
A general form of the Hamiltonian for electrons confined to a curved one-dimensional (1D) channel with spin-orbit coupling (SOC) linear in momentum is rederived and is applied to a U-shaped channel. Discretizing the derived continuous 1D Hamiltonian to a tight-binding version, the Landauer-Keldysh formalism (LKF) for nonequilibrium transport can be applied. Spin transport through the U-channel based on the LKF is compared with previous quantum mechanical approaches. The role of a curvature-induced geometric potential which was previously neglected in the literature of the ring issue is also revisited. Transport regimes between nonadiabatic, corresponding to weak SOC or sharp turn, and adiabatic, corresponding to strong SOC or smooth turn, is discussed. Based on the LKF, interesting charge and spin transport properties are further revealed. For the charge transport, the interplay between the Rashba and the linear Dresselhaus (001) SOCs leads to an additional modulation to the local charge density in the half-ring part of the U-channel, which is shown to originate from the angle-dependent spin-orbit potential. For the spin transport, theoretically predicted eigenstates of the Rashba rings, Dresselhaus rings, and the persistent spin-helix state are numerically tested by the present quantum transport calculation.
Chang Ching-Ray
Chen Son-Hsien
Liu Ming-Hao
Wu Jhih-Sheng
No associations
LandOfFree
Spin and charge transport in U-shaped one-dimensional channels with spin-orbit couplings does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin and charge transport in U-shaped one-dimensional channels with spin-orbit couplings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin and charge transport in U-shaped one-dimensional channels with spin-orbit couplings will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-568555