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Resonance characteristics through double quantum dots embedded in series in an Aharonov-Bohm ring

Joe, Yong S and Kim, Jiseok and Satanin, Arkady M (2006) Resonance characteristics through double quantum dots embedded in series in an Aharonov-Bohm ring. Journal of Physics D: Applied Physics, 39 (9). pp. 1766-1772.

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Official URL: http://stacks.iop.org/0022-3727/39/1766

Abstract

Stimulated by recent intriguing experiments with a quantum dot in an Aharonov-Bohm (AB) ring, we investigate novel resonant phenomena by studying the total transmission probability of nanoscale AB rings with embedded double quantum dots in one arm and a magnetic flux passing through its centre. In this system, we show the overlapping and merging of both Breit-Wiger (BW) and Fano resonances as the interaction parameter between the dots changes. In the strong overlapping regime of Fano resonances, the transmission zeros leave the real-energy axis and move away in opposite directions in the complex-energy plane. The simultaneous swings (from Fano to BW and then back to Fano resonance) of a pair of Fano resonances in the overlapping regime are observed by modulating the magnetic flux threading the AB ring. The periodic tuning of the Fano resonance for a fixed interaction parameter is also discussed as the magnetic flux increases.

Item Type:Article
ID Code:5406
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:11
Last Modified:06 Feb 2010 11:53

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