932 citations · 1.6k across the 17 of their papers we have counts for
18 papers
Quantum Criticality of Liquid-Gas Transition in a Binary Bose Mixture
Li He, Haowei Li, Wei Yi +1
Quantum liquid, in the form of a self-bound droplet, is stabilized by a subtle balance between the mean-field contribution and quantum fluctuations. While a liquid-gas transition i…
First-order Bose-Einstein condensation with three-body interacting bosons
Hui Hu, Zeng-Qiang Yu, Jia Wang +1
Bose-Einstein condensation, observed in either strongly interacting liquid helium or weakly interacting atomic Bose gases, is widely known to be a second-order phase transition. He…
Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature
Li He, Peipei Gao, Zeng-Qiang Yu
For pseudospin-half bosons with inter-spin attraction and intra-spin repulsion, normal phase and Bose condensed phase can coexist at finite temperature. The homogeneous system is u…
Collective excitation of a trapped Bose-Einstein condensate with spin-orbit coupling
Li Chen, Han Pu, Zeng-Qiang Yu +1
We investigate the collective excitations of a Raman-induced spin-orbit coupled Bose-Einstein condensate confined in a quasi one-dimension harmonic trap using the Bogoliubov method…
Landau's criterion for an anisotropic Bose-Einstein condensate
Zeng-Qiang Yu
In this work, we discuss the Landau's criterion for anisotropic superfluidity. To this end, we consider a point-like impurity moving in a uniform Bose-Einstein condensate with eith…
Superfluid Density of a Spin-orbit Coupled Bose Gas
Yi-Cai Zhang, Zeng-Qiang Yu, Tai Kai Ng +3
We discuss the superfluid properties of a Bose-Einstein condensed gas with spin-orbit coupling, recently realized in experiments. We find a finite normal fluid density at zer…
Phase transitions and elementary excitations in spin-1 Bose gases with Raman-induced spin-orbit coupling
Zeng-Qiang Yu
We study the ground state phase diagram and the quantum phase transitions in spin-1 Bose gases with Raman induced spin-orbit coupling. In addition to the Bose-Einstein condensates…
Equation of state and phase transition in spin-orbit-coupled Bose gases at finite temperature: A perturbation approach
Zeng-Qiang Yu
We study two-component Bose gases with Raman induced spin-orbit coupling via a perturbation approach at finite temperature. For weak coupling, free energy is expanded in terms of R…
Ground-state phase diagram and critical temperature of two-component Bose gases with Rashba spin-orbit coupling
Zeng-Qiang Yu
Ground-state phase diagram of two-component Bose gases with Rashba spin-orbit coupling is determined via a variational approach. A phase in which the fully polarized condensate occ…
Properties of Bose Gases with Raman-Induced Spin-Orbit Coupling
Wei Zheng, Zeng-Qiang Yu, Xiaoling Cui +1
In this paper we investigate the properties of Bose gases with Raman-induced spin-orbit(SO) coupling. It is found that the SO coupling can greatly modify the single particle densit…
Spin-Orbit Coupled Degenerate Fermi Gases
Pengjun Wang, Zeng-Qiang Yu, Zhengkun Fu +5
Spin-orbit coupling plays an increasingly important role in the modern condensed matter physics. For instance, it gives birth to topological insulators and topological superconduct…
Spin-Orbit Coupled Fermi Gases across a Feshbach Resonance
Zeng-Qiang Yu, Hui Zhai
In this letter we study both ground state properties and the superfluid transition temperature of a spin-1/2 Fermi gas across a Feshbach resonance with a synthetic spin-orbit coupl…
Stability Condition of a Strongly Interacting Boson-Fermion Mixture across an Inter-Species Feshbach Resonance
Zeng-Qiang Yu, Shizhong Zhang, Hui Zhai
We study the properties of dilute bosons immersed in a single component Fermi sea across a broad boson-fermion Feshbach resonance. The stability of the mixture requires that the ba…
Induced interaction in a spin-polarized Fermi gas
Zeng-Qiang Yu, Lan Yin
We study the effect of the induced interaction on the superfluidtransition temperature of a spin-polarized Fermi gas. In the BCS limit, the polarization is very small in the superf…
Molecular Bose-Einstein condensation in a Bose gas with a wide Feshbach resonance at finite temperatures
Zeng-Qiang Yu, Lan Yin
Bose-Einstein condensation (BEC) of Feshbach molecules in a homogeneous Bose gas is studied at finite temperatures in a single-channel mean-field approach where the Hartree-Fock en…
Collinear antiferromagnetic state in a two-dimensional Hubbard model at half filling
Zeng-Qiang Yu, Lan Yin
In a half-filled Hubbard model on a square lattice, the next-nearest-neighbor hopping causes spin frustration, and the collinear antiferromagnetic (CAF) state appears as the ground…
The induced interaction in a Fermi gas with a BEC-BCS crossover
Zeng-Qiang Yu, Kun Huang, Lan Yin
We study the effect of the induced interaction on the superfluid transition temperature of a Fermi gas with a BEC-BCS crossover. The Gorkov-Melik-Barkhudarov theory about the induc…
Ginzburg-Landau theory of a trapped Fermi gas with a BEC-BCS crossover
Kun Huang, Zeng-Qiang Yu, Lan Yin
The Ginzburg-Landau theory of a trapped Fermi gas with a BEC-BCS crossover is derived by the path-integral method. In addition to the standard Ginzburg-Landau equation, a second eq…