Topological charge pump by surface acoustic waves

doi:10.1088/1674-1056/25/6/067301

Abstract

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 non-monotonous current plateaus simultaneously pumped by two homodromous surface acoustic waves.

Keywords: quantized pumping surface acoustic wave topological band structure

Received: 22 September 2015
Revised: 03 March 2016
Accepted manuscript online:

PACS:	73.20.At	(Surface states, band structure, electron density of states)
	73.21.Hb	(Quantum wires)
	72.50.+b	(Acoustoelectric effects)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11374036) and the National Basic Research Program of China (Grant No. 2012CB821403).

Corresponding Authors: Shi-Jie Yang
E-mail: yangshijie@tsinghua.org.cn

Cite this article:

Yi Zheng(郑一), Shi-Ping Feng(冯世平), Shi-Jie Yang(杨师杰) Topological charge pump by surface acoustic waves 2016 Chin. Phys. B 25 067301

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