Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-11-08
Physical Review B 72, 205310 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 12 figure
Scientific paper
10.1103/PhysRevB.72.205310
Quantum transport through a double Aharonov-Bohm-interferometer in the presence of Andreev reflection is investigated in terms of the nonequilibrium Green function method with which the reflection current is obtained. Tunable Andreev reflection probabilities depending on the interdot coupling strength and magnetic flux as well are analysised in detail. It is found that the oscillation period of the reflection probability with respect to the magnetic flux for the double interferometer depends linearly on the ratio of two parts magnetic fluxes n, i.e. 2(n+1)pi, while that of a single interferometer is 2pi. The coupling strength not only affects the height and the linewidth of Andreev reflection current peaks vs gate votage but also shifts the peak positions. It is furthermore demonstrated that the Andreev reflection current peaks can be tuned by the magnetic fluxes.
Gao Ying-Fang
Liang Jing-Qiu
Yu Hui
Zhang Yong-Ping
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