Finger-gate array quantum pumps:pumping characteristics and mechanisms

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dc.creatorChung, S. W.
dc.creatorTang, C. S.
dc.creatorChu, C. S.
dc.creatorChang, C. Y.
dc.date2003-06-07
dc.date2004-06-28
dc.date.accessioned2026-07-07T02:51:43Z
dc.date.available2026-07-07T02:51:43Z
dc.descriptionWe study the pumping effects, in both the adiabatic and nonadiabatic regimes, of a pair of \QTR{it}{finite} finger-gate array (FGA) on a narrow channel. Connection between the pumping characteristics and associated mechanisms is established. The pumping potential is generated by ac biasing the FGA pair. For a single pair (N=1) of finger gates (FG's), the pumping mechanism is due to the coherent inelastic scattering of the traversing electron to its subband threshold. For a pair of FGA with pair number $N>2$, the dominant pumping mechanism becomes that of the time-dependent Bragg reflection. The contribution of the time-dependent Bragg reflection to the pumping is enabled by breaking the symmetry in the electron transmission when the pumping potential is of a predominant propagating type. This propagating wave condition can be achieved both by an appropriate choice of the FGA pair configuration and by the monitoring of a phase difference $ϕ$ between the ac biases in the FGA pair. The robustness of such a pumping mechanism is demonstrated by considering a FGA pair with only pair number N=4.
dc.description7 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0306194
dc.identifierhttp://arxiv.org/abs/cond-mat/0306194
dc.identifierPhys. Rev. B 70, 085315 (2004)
dc.identifierdoi:10.1103/PhysRevB.70.085315
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21572
dc.subjectMesoscale and Nanoscale Physics
dc.titleFinger-gate array quantum pumps:pumping characteristics and mechanisms
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