Analysis of a multiple-quantum-dots embedded ring structure for potential optically-controlled quantum switch or spin filter.
Sci Rep 2020;
10:16280. [PMID:
33004924 PMCID:
PMC7530756 DOI:
10.1038/s41598-020-73275-x]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Accepted: 08/06/2020] [Indexed: 11/08/2022] Open
Abstract
We theoretically study the average current through a ring embedded with multiple quantum dots in each arm subjected to a time-dependent external field. A current resonance band can be observed in a six-quantum-dot system. In the presence of a time-dependent external field, mutual transformation occurs between the resonance band and antiresonance band, indicating an effective optically-controlled quantum switch can be realized in a wider quantum dot's energy regime. As the Zeeman effect is introduced, the conversion between 100 and - 100% for spin polarization [Formula: see text] can be realized by adjusting the frequency of time-dependent external field, suggesting a physical scheme of an optically-controlled spin filter. The present work sheds lights onto the design and quantum computation of future nano-devices.
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