Effective p-wave interaction and topological superfluids in s-wave quantum gases
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p-wave interaction in cold atoms may give rise to exotic topological superfluids. However, the realization of p-wave interaction in a cold atom system is experimentally challenging. Here we propose a simple scheme to synthesize effective p-wave interaction in conventional s-wave interacting quantum gases. The key idea is to load atoms into a spin-dependent optical lattice potential. Using two concrete examples involving spin-1/2 fermions, we show how the original system can be mapped into a model describing spinless fermions with nearest-neighbor p-wave interaction, whose ground state can be a topological superfluid that supports Majorana fermions under proper conditions. Our proposal has the advantage that it does not require spin-orbit coupling or loading atoms onto higher orbitals, which is the key in earlier proposals to synthesize effective p-wave interaction in s-wave quantum gases, and may provide a completely new route for realizing p-wave topological superfluids.
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Wang, Bin, Zheng, Zhen, Pu, Han, et al.. "Effective p-wave interaction and topological superfluids in s-wave quantum gases." Physical Review A, 93, no. 3 (2016) American Physical Society: https://doi.org/10.1103/PhysRevA.93.031602.