222 citations · 1.7k across the 67 of their papers we have counts for
20 papers · 1 filter
Machine learning of XY model on a spherical Fibonacci lattice
Chen-Hui Song, Qu-Cheng Gao, Xu-Yang Hou +5
We study the XY model on a spherical surface inspired by recently realized spherically confined atomic gases. Instead of a traditional latitude-longitude lattice, we introduce a mu…
BCS-BEC crossover of atomic Fermi superfluid in a spherical bubble trap
Yan He, Hao Guo, Chih-Chun Chien
We present a theory of a two-component atomic Fermi gas with tunable attractive contact interactions on a spherical shell going through the Bardeen-Cooper-Schrieffer (BCS) - Bose E…
Dynamical quantum phase transitions on cross-stitch flat band networks
Tong Liu, Hao Guo
We study the quench dynamics on cross-stitch flat band networks by a sudden change of the inter-cell hopping strength . For quench processes with changing as $J=0\rightarrow…
Fate of topological states and mobility edges in one-dimensional slowly varying incommensurate potentials
Tong Liu, Hai-Yang Yan, Hao Guo
We investigate the interplay between disorder and superconducting pairing for a one-dimensional -wave superconductor subject to slowly varying incommensurate potentials with mob…
Dynamic density structure factor of a unitary Fermi gas at finite temperature
Hao Guo, Yan He, Lianyi He
We present a theoretical investigation of the dynamic density structure factor of a strongly interacting Fermi gas near a Feshbach resonance at finite temperature. The study is bas…
Shear Viscosity of Uniform Fermi Gases with Population Imbalance
Weimin Cai, Yan He, Hao Guo +1
The shear viscosity plays an important role in studies of transport phenomena in ultracold Fermi gases and serves as a diagnostic of various microscopic theories. Due to the compli…
Relation connecting thermodynamics and transport of atomic unitary Fermi superfluids
Hao Guo, Weimin Cai, Yan He +1
The shear viscosity has been shown to be equal to the product of pressure and relaxation time in normal scale-invariant fluids, but the presence of superfluidity at low temperature…
Berry phase, entanglement entropy, and algebraic properties of ground states of BCS and BEC superfluids
Hao Guo, Yan He, Chih-Chun Chien
By using Bogoliubov transformations to construct the ground states of fermionic Bardeen-Cooper-Schrieffer (BCS) superfluids and weakly-interacting Bose gases supporting Bose Einste…
Establishing the Gauge Invariant Linear Response of Fermionic Superfluids with Pair Fluctuations: A Diagrammatic approach
Yan He, Hao Guo
We present a manifestly gauge invariant linear response theory for ultra-cold Fermi gases undergoing BCS-Bose-Einstein Condensation (BEC) crossover with pair fluctuation effect inc…
Conserving Approximation of Pairing theories in Fermionic superfluid phase
Yan He, Hao Guo
Respecting the conservation laws of momentum and energy in a many body theory is very important for understanding the transport phenomena. The previous conserving approximation req…
Gauge Invariant Linear Response Theories for Ultracold Fermi Gases with Pseudogap
Hao Guo, Yan He
Recent experimental progresses allow for exploring some important physical quantities of ultracold Fermi gases, such as the compressibility, spin susceptibility, viscosity, optical…
Shear viscosity and imperfect fluidity in bosonic and fermionic superfluids
Rufus Boyack, Hao Guo, K. Levin
In this paper we address the ratio of the shear viscosity to entropy density in bosonic and fermionic superfluids. A small is associated with nearly perfect fluidity, a…
Density and Spin Linear Response of Atomic Fermi Superfluids with Population Imbalance in BCS-BEC Crossover
Hao Guo, Yang Li, Yan He +1
We present a theoretical study of the density and spin (representing the two components) linear response of Fermi superfluids with tunable attractive interactions and population im…
The Compressibility in Strongly Correlated Superconductors and Superfluids: From BCS to BEC
Hao Guo, Yan He, Chih-Chun Chien +1
We present a theoretical study of the compressibility, , in a Fermi gas with attractive contact interactions, providing predictions for the strongly-attractive regime and the su…
Fundamental Constraints on Linear Response Theories of Fermi Superfluids Above and Below
Hao Guo, Chih-Chun Chien, Yan He +1
We present fundamental constraints required for a consistent linear response theory of fermionic superfluids and address temperatures both above and below the transition temperatur…
Phase diagrams of Fermi gases in a trap with mass and population imbalances at finite temperature
Jibiao Wang, Hao Guo, Qijin Chen
The pairing and superfluid phenomena in a two-component Fermi gas can be strongly affected by the population and mass imbalances. Here we present phase diagrams of atomic Fermi gas…
Comment on "Density and Spin response of a strongly-interacting Fermi gas in the attractive and quasi-repulsive regime"
Chi-Chun Chien, Hao Guo, K. Levin
This is a comment on Phys. Rev. Lett. 108, 080401 (2012) by Palestini et al. We pointed out that the diagrammatic method in that article violates gauge invariance. As a consequence…
Spin Transport in Cold Fermi gases: A Pseudogap Interpretation of Spin Diffusion Experiments at Unitarity
Dan Wulin, Hao Guo, Chih-Chun Chien +1
We address recent spin transport experiments in ultracold unitary Fermi gases. We provide a theoretical understanding for how the measured temperature dependence of the spin diffus…
Microscopic Approach to Shear Viscosities in Superfluid Gases: From BCS to BEC
H. Guo, D. Wulin, C. C. Chien +1
We compute the shear viscosity, , at general temperatures , in a BCS-BEC crossover scheme which is demonstrably consistent with conservation laws. The study of is importa…
Comparative Study of BCS-BEC Crossover Theories above : the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
Chih-Chun Chien, Hao Guo, Yan He +1
This paper presents a comparison of two finite-temperature BCS-Bose Einstein condensation (BEC) crossover theories above the transition temperature: Nozieres Schmitt-Rink (NSR) the…