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Phys Rev Lett. 2015 Nov 27;115(22):225301. Epub 2015 Nov 24.

Chiral d-Wave Superfluid in Periodically Driven Lattices.

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Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.


A chiral d-wave superfluid is a preliminary example of interacting topological matter. However, unlike s-wave superfluids prevalent in nature, its existence requires a strong d-wave interaction, a criterion that is difficult to access in ordinary systems. There is no experimental observation of such unconventional superfluid at the moment. Here, we present a new principle for creating a two-dimensional (2D) chiral d-wave superfluid using periodically driven lattices. Because of an imprinted 2D pseudospin-orbit coupling, where the sublattice index serves as the pseudospin, the s-wave interaction between two hyperfine spin states naturally creates a chiral d-wave superfluid. This scheme can be directly implemented in current experiments.

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