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Topological Superfluid of Interacting Ultracold Atoms in an Optical Lattice
Speaker Prof Zhifang Xu, Southern University of Science and Technology
Date 17 May 2018 (Thursday)
Time 16:00 - 17:30
Venue Lecture Theatre H (Lifts 27-28), HKUST

Searching for topological states of quantum matter is at the forefront of ultracold atoms. Currently, consorted efforts are made to simulate famous electronic topological models that are non-interacting via loading atoms into the lowest s-band, assisted by synthetic magnetic flux or spin-orbit coupling. In contrast, in this talk we show that by loading atoms into the higher p-band of optical lattices, interaction among atoms could spontaneously generate topologically nontrivial states. First, focusing on the experimentally realized chiral bosonic p-wave superfluid, we show that it supports Dirac bosons in the elementary excitation spectra and a topological phase transition occurs due to further symmetry breaking from adding an extra lattice potential. Second, we find that topological odd-parity superfluidity robustly arises in a cold two-component Fermi gas with three rudimental aspects that are readily available in current cold atom experiments, namely: spin population imbalance, Feshbach resonance tuned s-wave interaction, and a spin-independent optical lattice.