Dark states and Aharonov-Bohm oscillations in multi-quantum-dot systems

作者：Wang Qiong; Liu Jun; Tang Ning; Zeng Hao-Sheng^*

来源：Chinese Physics B, 2011, 20(2): 020303.

DOI：10.1088/1674-1056/20/2/020303

• quantum dot
• darkstate
• Aharonov-Bohmerect

We study the formation of dark states and the Aharonov-Bohm erect in symmetrically/asymmetricallycoupled three- and four-quantum-dot systems. It is found that without a transversemagnetic field, destructive interference can trap an electron in a dark state. However, the introduction of a transverse magnetic field can disrupt the dark state, giving rise to oscillation in current. For symmetrically structured quantum-dot systems, the oscillation has a period of one flux quanta. But for asymmetrically structured dot systems, the period of oscillation is halved. In addition, the dephasing due to charge noise also blocks the formation of dark states, while it does not change the period of oscillation. W e

• 出版日期2011-2
• 单位湖南师范大学