Nonadiabatic quantum pumping in mesoscopic nanostructures

C. S. Tang, Chon-Saar Chu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

We consider a nonadiabatic quantum pumping phenomenon in a ballistic narrow constriction. The pumping is induced by a potential that has both spatial and temporal periodicity characterized by K and Ω. In the zero frequency (Ω=0) limit, the transmission through narrow constriction exhibits valley structures due to the opening up of energy gaps in the pumping region - a consequence of the K periodicity. These valley structures remain robust in the regime of finite Ω, while their energies of occurrence are shifted by about ℏΩ/2. The direction of these energy shifts depend on the directions of both the phase-velocity of the pumping potential and the transmitting electrons. This frequency dependent feature of the valley structures gives rise to both the asymmetry in the transmission coefficients and the pumping current. An experimental setup is suggested for a possible observation of our nonadiabatic quantum pumping findings.

Original languageEnglish
Pages (from-to)353-357
Number of pages5
JournalSolid State Communications
Volume120
Issue number9-10
DOIs
StatePublished - 2 Nov 2001

Keywords

  • A. Nanostructures
  • D. Nonadiabatic behaviour
  • D. Quantum transport

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