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Sun, QF; Lin, TH
Transient current through a quantum dot with two time-dependent barriers
KeywordTransport Device Model
AbstractWe investigate the transient-current characteristics of a quantum dot coupled to two leads through two time-dependent barriers. A general formula for the time-dependent current j(t) is derived by using the nonequilibrium-Green-function technique. Two particular cases, those of rectangular-pulse modulations and harmonic modulations imposed on the two barriers, are studied in detail. For the rectangular-pulse modulations, a turnstile effect is obtained if the full width of the resonant state (Gamma) is much larger than the frequency (omega), i.e. Gamma much less than omega; and the special behaviour of the transient current j(t) is attributed to the phase coherence due to the time variation of the barriers. For the harmonic modulations, we find that a new energy scale Aw emerges if Gamma < omega, and the main resonant peak is split into two peaks.
Subject AreaPhysics
Indexed BySCI
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Document Type期刊论文
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GB/T 7714
Sun, QF,Lin, TH. Transient current through a quantum dot with two time-dependent barriers[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,1997,9(14):3043-3053.
APA Sun, QF,&Lin, TH.(1997).Transient current through a quantum dot with two time-dependent barriers.JOURNAL OF PHYSICS-CONDENSED MATTER,9(14),3043-3053.
MLA Sun, QF,et al."Transient current through a quantum dot with two time-dependent barriers".JOURNAL OF PHYSICS-CONDENSED MATTER 9.14(1997):3043-3053.
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