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Chin. Phys. B, 2016, Vol. 25(6): 067301    DOI: 10.1088/1674-1056/25/6/067301

Topological charge pump by surface acoustic waves

Yi Zheng(郑一), Shi-Ping Feng(冯世平), Shi-Jie Yang(杨师杰)
Department of Physics, Beijing Normal University, Beijing 100875, China

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      Published:  05 June 2016
PACS:  73.20.At (Surface states, band structure, electron density of states)  
  73.21.Hb (Quantum wires)  
  72.50.+b (Acoustoelectric effects)  

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:

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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