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.
Received: 04 April 2007
Revised: 26 April 2007
Accepted manuscript online:
Fund: Project supported by the National Natural Science
Foundation of China (Grant
No~10475053).
Cite this article:
Wang Jian-Ming(王建明), Wang Rui(王瑞) and Liang Jiu-Qing(梁九卿) Spin-polarized quantum transport through an Aharonov--Bohm quantum-dot-ring 2007 Chinese Physics 16 2075
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
