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Topological insulator and particle pumping in a one-dimensional shaken optical lattice.

Authors :
Feng Mei
Jia-Bin You
Dan-Wei Zhang
Yang, X. C.
Fazio, R.
Shi-Liang Zhu
Kwek, L. C.
Source :
Physical Review A: Atomic, Molecular & Optical Physics. Dec2014, Vol. 90 Issue 6-B, p1-8. 8p.
Publication Year :
2014

Abstract

We propose a simple method to simulate and detect topological insulators with cold atoms trapped in a one-dimensional bichromatic optical lattice subjected to a time-periodic modulation. The tight-binding form of this shaken system is equivalent to the periodically driven Aubry-Andre model. We demonstrate that this model can be mapped into a two-dimensional Chern insulator model, whose energy spectrum hosts a topological phase within an experimentally accessible parameter regime. By tuning the laser phase adiabatically, such one-dimensional system constitutes a natural platform to realize topological particle pumping. We show that the Chern number characterizing the topological features of this system can be measured by detecting the density shift after one cycle of pumping. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10502947
Volume :
90
Issue :
6-B
Database :
Academic Search Index
Journal :
Physical Review A: Atomic, Molecular & Optical Physics
Publication Type :
Periodical
Accession number :
100644424
Full Text :
https://doi.org/10.1103/PhysRevA.90.063638