762 citations · 3.3k across the 87 of their papers we have counts for
16 papers · 1 filter
Cuprate diamagnetism in the presence of a pseudogap: Beyond the standard fluctuation formalism
Rufus Boyack, Qijin Chen, A. A. Varlamov +1
It is often claimed that among the strongest evidence for preformed-pair physics in the cuprates are the experimentally observed large values for the diamagnetic susceptibility and…
Probing the Spectral Function Using Momentum Resolved Radio Frequency Spectroscopy in Trapped Fermi Gases
Qijin Chen, K. Levin
We address recent momentum resolved radio frequency (RF) experiments on ultracold trapped Fermi gases of K. We show that momentum resolved RF probes provide measurements of…
Thermodynamics and superfluid density in BCS-BEC crossover with and without population imbalance
Yan He, Chih-Chun Chien, Qijin Chen +1
We address the thermodynamics, density profiles and superfluid density of trapped fermions undergoing BCS-BEC crossover, with and without population imbalance. Our approach represe…
Radio Frequency Spectroscopy of Trapped Fermi Gases with Population Imbalance
Yan He, Chih-Chun Chien, Qijin Chen +1
Motivated by recent experiments, we address, in a fully self consistent fashion, the behavior and evolution of radio frequency (RF) spectra as temperature and polarization are vari…
First and second sound modes at finite temperature in trapped Fermi gases from BCS to BEC
Yan He, Qijin Chen, Chih-Chun Chien +1
We determine the temperature dependence of first and second sound mode frequencies for trapped Fermi gases undergoing BCS to Bose Einstein condensation (BEC) crossover. Our res…
Fermionic superfluidity: From high Tc superconductors to ultracold Fermi gases
Qijin Chen, Chih-Chun Chien, Yan He +1
We present a pairing fluctuation theory which self-consistently incorporates finite momentum pair excitations in the context of BCS--Bose-Einstein condensation (BEC) crossover, and…
Superfluid phase diagrams of trapped Fermi gases with population imbalance
Chih-Chun Chien, Qijin Chen, Yan He +1
We present phase diagrams for population imbalanced, trapped Fermi superfluids near unitarity. In addition to providing quantitative values for the superfluid transition temperatur…
Single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrell state in BCS--Bose-Einstein condensation crossover
Yan He, Chih-Chun Chien, Qijin Chen +1
We study the single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) states for BCS--Bose-Einstein condensation (BEC) crossover at general temperatures . Because we include th…
Finite Temperature Effects in Ultracold Fermi Gases
K. Levin, Qijin Chen
This article is written as a Lecture given in the 2006 Varenna Summer School on "Ultracold Fermi Gases". Here we present a review of BCS--Bose Einstein condensation (BEC) crossover…
Theory of Superfluids with Population Imbalance: Finite Temperature and BCS-BEC Crossover Effects
Qijin Chen, Yan He, Chih-Chun Chien +1
In this paper we present a very general theoretical framework for addressing fermionic superfluids over the entire range of BCS to Bose Einstein condensation (BEC) crossover in the…
Finite temperature effects in trapped Fermi gases with population imbalance
Chih-Chun Chien, Qijin Chen, Yan He +1
We study the finite temperature behavior of trapped Fermi gases as they undergo BCS-Bose Einstein condensation (BEC) crossover, in the presence of a population imbalance. Our r…
Intermediate temperature superfluidity in an atomic Fermi gas with population imbalance
Chih-Chun Chien, Qijin Chen, Yan He +1
We derive the underlying finite temperature theory which describes Fermi gas superfluidity with population imbalance in a homogeneous system. We compute the pair formation temperat…
Finite Temperature Momentum Distribution of a Trapped Fermi Gas
Qijin Chen, C. A. Regal, D. S. Jin +1
We present measurements of the temperature-dependent momentum distribution of a trapped Fermi gas consisting of K in the BCS-BEC crossover regime. Accompanying theoretical r…
Understanding the superfluid phase diagram in trapped Fermi gases
Qijin Chen, C. A. Regal, M. Greiner +2
Trapped ultracold Fermi gases provide a system that can be tuned between the BCS and BEC regimes by means of a magnetic-field Feshbach resonance. Condensation of fermionic atom pai…
Magnetic Field Effects in the Pseudogap Phase: A Precursor Superconductivity Scenario
Andrew P. Iyengar, Ying-Jer Kao, Qijin Chen +1
We demonstrate that the observed dependences of and on small magnetic fields can be readily understood in a precursor superconductivity approach to the pseudogap phase.…
Magnetic Field Effects in the Pseudogap Phase: A Competing Energy Gap Scenario for Precursor Superconductivity
Ying-Jer Kao, Andrew P. Iyengar, Qijin Chen +1
We study the sensitivity of T_c and T^* to low fields, H, within the pseudogap state using a BCS-based approach extended to arbitrary coupling. We find that T^* and T_c, which are…