Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides
Abstract
Ballistic spin transport through waveguides, with symmetric or asymmetric double stubs attached to them periodically, is studied systematically in the presence of a weak spin-orbit coupling that makes the electrons precess. By an appropriate choice of the waveguide length and of the stub parameters injected spin-polarized electrons can be blocked completely and the transmission shows a periodic and nearly square-type behavior, with values 1 and 0, with wide gaps when only one mode is allowed to propagate in the waveguide. A similar behavior is possible for a certain range of the stub parameters even when two-modes can propagate in the waveguide and the conductance is doubled. Such a structure is a good candidate for establishing a realistic spin transistor. A further modulation of the spin current can be achieved by inserting defects in a finite-number stub superlattice. Finite-temperature effects on the spin conductance are also considered.
Keywords
Cite
@article{arxiv.cond-mat/0204415,
title = {Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides},
author = {X. F. Wang and P. Vasilopoulos and F. M. Peeters},
journal= {arXiv preprint arXiv:cond-mat/0204415},
year = {2015}
}
Comments
19 pages, 8 figures