Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.050502
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Funding
- National Key R&D Program of China [2018YFA0307200]
- National Natural Science Foundation of China [91636104, 11974331, 91736209]
- Natural Science Foundation of Zhejiang province [LZ18A040001]
- Fundamental Research Funds for the Central Universities
- National Key Research and Development Program of China [2016YFA0301700, 2017YFA0304100]
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We report the experimental implementation of discrete-time topological quantum walks of a Bose-Einstein condensate in momentum space. Introducing stroboscopic driving sequences to the generation of a momentum lattice, we show that the dynamics of atoms along the lattice is effectively governed by a periodically driven Su-Schrieffer-Heeger model, which is equivalent to a discrete-time topological quantum walk. We directly measure the underlying topological invariants through time-averaged mean chiral displacements, which are consistent with our experimental observation of topological phase transitions. We then observe interaction-induced localization in the quantum-walk dynamics, where atoms tend to populate a single momentum-lattice site under interactions that are nonlocal in momentum space. Our experiment opens up the avenue of investigating discrete-time topological quantum walks using cold atoms, where the many-body environment and tunable interactions offer exciting new possibilities.
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