Topological charge pump by surface acoustic waves

Quantized electron pumping by the surface acoustic wave across barriers created by a sequence of split metal gates is interpreted from the viewpoint of topology.The surface acoustic wave serves as a one-dimensional periodical potential whose energy spectrum possesses the Bloch band structure.The tim...

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Veröffentlicht in:Chinese physics B 2016-06, Vol.25 (6), p.468-473
1. Verfasser: 郑一 冯世平 杨师杰
Format: Artikel
Sprache:eng
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Zusammenfassung:Quantized electron pumping by the surface acoustic wave across barriers created by a sequence of split metal gates is interpreted from the viewpoint of topology.The surface acoustic wave serves as a one-dimensional periodical potential whose energy spectrum possesses the Bloch band structure.The time-dependent phase plays the role of an adiabatic parameter of the Hamiltonian which induces a geometrical phase.The pumping currents are related to the Chern numbers of the filled bands below the Fermi energy.Based on this understanding,we predict a novel effect of quantized but nonmonotonous current plateaus simultaneously pumped by two homodromous surface acoustic waves.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/6/067301