Topological quantum pump in serpentine-shaped semiconducting narrow channels

Sudhakar Pandey, Niccoló Scopigno, Paola Gentile, Mario Cuoco, Carmine Ortix

Research output: Contribution to journalArticleAcademicpeer-review


We propose and analyze theoretically a one-dimensional solid-state electronic setup that operates as a topological charge pump in the complete absence of superimposed oscillating local voltages. The system consists of a semiconducting narrow channel with a strong Rashba spin-orbit interaction patterned in a mesoscale serpentine shape. A rotating planar magnetic field serves as the external ac perturbation, and cooperates with the Rashba spin-orbit interaction, which is modulated by the geometric curvature of the electronic channel to realize the topological pumping protocol, originally introduced by Thouless, in a different fashion. We expect the precise pumping of electric charges in our mesoscopic quantum device to be relevant for quantum metrology purposes.

Original languageEnglish
Article number241103
Number of pages5
JournalPhysical Review B
Issue number24
Publication statusPublished - 15 Jun 2018


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