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10 papers · 2 filters
Spin-Orbit Driven Transitions Between Mott Insulators and Finite Momentum Superfluids of Bosons in Optical Lattices
Mi Yan, Yinyin Qian, Hoi-Yin Hui +3
Synthetic spin-orbit coupling in ultracold atomic gases can be taken to extremes rarely found in solids. We study a two dimensional Hubbard model of bosons in an optical lattice in…
Majorana fermions in quasi-1D and higher dimensional ultracold fermionic optical lattices
Chunlei Qu, Ming Gong, Yong Xu +2
We show that Majorana fermions (MFs) exist in two- and three-dimensional (2D,3D) fermionic optical lattices with strictly 1D spin-orbit coupling (SOC) which has already been realiz…
Anisotropic Weyl Fermions from Quasiparticle Excitation Spectrum of a 3D Fulde-Ferrell Superfluid
Yong Xu, Rui-Lin Chu, Chuanwei Zhang
Weyl fermions, first proposed for describing massless chiral Dirac fermions in particle physics, have not been observed yet in experiments. Recently, much effort has been devoted t…
Topological Uniform Superfluid and FFLO Phases in 3D to 1D crossover of spin-orbit coupled Fermi gases
Kangjun Seo, Chuanwei Zhang, Sumanta Tewari
We consider the quasi-one dimensional system realized by an array of weakly coupled parallel one-dimensional "tubes" in a two-dimensional lattice which permits free motion of atoms…
Emergent Kinetics and Fractionalized Charge in 1D Spin-Orbit Coupled Flatband Optical Lattices
Fei Lin, Chuanwei Zhang, V. W. Scarola
Recent ultracold atomic gas experiments implementing synthetic spin-orbit coupling allow access to flatbands that emphasize interactions. We model spin-orbit coupled fermions in a…
Topological Superfluids with Finite Momentum Pairing and Majorana Fermions
Chunlei Qu, Zhen Zheng, Ming Gong +5
Majorana fermions, quantum particles that are their own anti-particles, are not only of fundamental importance in elementary particle physics and dark matter, but also building blo…
Competing superfluid orders in spin-orbit coupled fermionic cold atom optical lattices
Yong Xu, Chunlei Qu, Ming Gong +1
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state with non-zero total momentum Cooper pairs in a large magnetic field, was first predicted about 50 years a…
FFLO or Majorana superfluids: The fate of fermionic cold atoms in spin-orbit coupled optical lattices
Chunlei Qu, Ming Gong, Chuanwei Zhang
The recent experimental realization of spin-orbit coupling (SOC) for ultra-cold atoms opens a completely new avenue for exploring new quantum matter. In experiments, the SOC is imp…
Thermodynamic signatures for topological phase transitions to Majorana and Weyl superfluids in ultracold Fermi gases
Kangjun Seo, Chuanwei Zhang, Sumanta Tewari
We discuss the thermodynamic signatures for the topological phase transitions into Majorana and Weyl superfluid phases in ultracold Fermi gases in two and three dimensions in the p…
Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensate
Chunlei Qu, Chris Hamner, Ming Gong +2
Spin-orbit coupled ultra-cold atoms provide an intriguing new avenue for the study of rich spin dynamics in superfluids. In this Letter, we observe Zitterbewegung, the simultaneous…