50 research outputs found
Spin-dependent hole quantum transport in Aharonov-Bohm ring structure: possible schemes for spin filter
We study the Aharonov-Bohm (AB) effect in two-dimensional mesoscopic frame in
hole systems. We show that differing from the AB effect in electron systems,
due to the presence of both the heavy hole and the light hole, the conductances
not only show the normal spin-unresolved AB oscillations, but also become
spin-separated. Some schemes for spin filter based on the abundant interference
characteristics are proposed.Comment: 4 pages, 5 figures. Phys. Lett. A, 2005, in pres
Spin oscillations in transient diffusion of a spin pulse in n-type semiconductor quantum wells
By studying the time and spatial evolution of a pulse of the spin
polarization in -type semiconductor quantum wells, we highlight the
importance of the off-diagonal spin coherence in spin diffusion and transport.
Spin oscillations and spin polarization reverse along the the direction of spin
diffusion in the absence of the applied magnetic field are predicted from our
investigation.Comment: 5 pages, 4 figures, accepted for publication in PR
Semileptonic decays of , , and
Stimulated by recent observations of the excited bottom-strange mesons
and , we calculate the semileptonic decays , which is relevant for the exploration of the
potential of searching these semileptonic decays in experiment.Comment: 11 pages, 3 figures, 9 tables. More discussion added, some
descriptions changed. The version to appear in EPJ