Spin-polarized quantum transport through an Aharonov--Bohm quantum-dot-ring |
| |
Authors: | Wang Jian-Ming Wang Rui and Liang Jiu-Qing |
| |
Institution: | Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China |
| |
Abstract: | In this paper the quantum transport through an Aharonov--Bohm (AB)
quantum-dot-ring with two dot-array arms described by a single-band
tight-binding Hamiltonian is investigated in the presence of
additional magnetic fields applied to the dot-array arms to produce
spin flip of electrons. A far richer interference pattern than
that in the charge transport alone is found. Besides the usual AB
oscillation the tunable spin polarization of the current by the
magnetic flux is a new observation and is seen to be particularly
useful in technical applications. The spectrum of transmission
probability is modulated by the quantum dot numbers on the up-arc and down-arc
of the ring, which, however, does not affect the period of the AB
oscillation. |
| |
Keywords: | spin-polarized Aharonov--Bohm ring interference |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|