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Transport through a quantum-dot-ring with one dot connected to two electron reservoirs

✍ Scribed by Hua Li; Tianquan Lü; Punan Sun; Zelong He; Haitao Yin

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
207 KB
Volume
37
Category
Article
ISSN
0026-2692

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✦ Synopsis

Making use of the equation of motion method and Keldysh Green function technique, we obtain a general current formula for a quantum-dot-ring with one of the dots connected to two electron reservoirs under a DC bias voltage. The transmission probability TðoÞ as a function of electron o curve is presented, which displays oscillation structure. The resonant states of the system are found to distribute within an interval centered at 0 (the dot energy level) with a width of two times the tunnel coupling amplitude between two neighboring dots, the number of the resonant peaks agrees with N (the number of the dots) when inter-dot tunnel coupling is sufficiently large and an odd-even behavior appears at the Fermi energy.

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