Spin-polarized quantum transport through an Aharonov-Bohm quantum-dot-ring

• 来源期刊: 中国物理（英文版）
• 关键词: spin-polarized Aharonov-Bohm ring interference
• 年，卷（期）: 2007,（7）
• 页码范围: 2075-2081
• 页数: 7页
• 语种: 英文

摘要

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.