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Quantum pumping of electrons by a moving modulated potential
Department of Physics and Engineering Physics, Stevens Institute of Technology, Castle Point on the Hudson, Hoboken, New Jersey 07030, USA. (Stevens Institute of Technology)
(Stevens Institute of Technology)
(Stevens Institute of Technology)
(Fordham University)
2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 77, no 15, 155319- p.Article in journal (Refereed) Published
Abstract [en]

Quantum pumping holds great potential for future applications in microtechnology and nanotechnology. Its main feature, which is the dissipationless charge transport, is theoretically possible via several different mechanisms. However, since no unambiguous verification has been experimentally demonstrated, the question of finding a viable mechanism for pumping remains open. Here, we study quantum pumping in an one dimensional electron waveguide with a single time-dependent barrier. The quantum pumping of electrons by using a potential barrier whose height and position are harmonically varied is analytically analyzed and by numerically solving the time-dependent Schrodinger equation. The pumped charge is analytically modeled by including two contributions in linear response theory. First, the scattering of electrons off a potential moving slowly through matter waves gives a contribution independent of the translational velocity of the potential. Second, Doppler-shifted scattering events give rise to a velocity dependent contribution, which is found in general to be small in comparison with the first one. The relative phase between the oscillations of the height and position is found to be the factor that determines to what extent either contribution is present.

Place, publisher, year, edition, pages
2008. Vol. 77, no 15, 155319- p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:du-11204DOI: 10.1103/PhysRevB.77.155319ISI: 000255457400089OAI: oai:DiVA.org:du-11204DiVA: diva2:565618
Available from: 2012-11-07 Created: 2012-11-07 Last updated: 2017-04-04Bibliographically approved

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Jääskeläinen, Markku
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