scholarly journals Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Lukas Rammelmüller ◽  
Yaqi Hou ◽  
Joaquín E. Drut ◽  
Jens Braun
Keyword(s):  
Fermi Gas ◽  
Normal Phase ◽  
Spin Susceptibility ◽  
Unitary Fermi Gas

Momentum distribution and the universal contact of a unitary Fermi gas with particle-hole fluctuation

2018 ◽  
Vol 32 (21) ◽  
pp. 1850249 ◽  
Author(s):  
Xiao-Xia Ruan ◽  
Hao Gong ◽  
Zheng-Ling Wang ◽  
Hong-Shi Zong
Keyword(s):  
Experimental Data ◽  
Momentum Distribution ◽  
Fermi Gas ◽  
Normal Phase ◽  
Large Momentum ◽  
Matrix Approximation ◽  
Self Consistent ◽  
Theoretical Predictions ◽  
Unitary Fermi Gas ◽  
T Matrix

We compute the momentum distribution of a homogeneous Fermi gas at unitarity in the normal phase within the framework of the non-self-consistent T-matrix approximation with particle-hole fluctuation. From the large-momentum behavior of momentum distribution, we obtain the contact for the unitary Fermi gas. We also compare our results with experimental data and other theoretical predictions.

High-frequency tail of the radio-frequency spectrum in a unitary Fermi gas with particle–hole fluctuation

2018 ◽  
Vol 32 (24) ◽  
pp. 1850280
Author(s):  
Xiao-Xia Ruan ◽  
Fei Wang ◽  
Hao Gong ◽  
Zheng-Ling Wang ◽  
Hong-Shi Zong
Keyword(s):  
Radio Frequency ◽  
Frequency Spectrum ◽  
High Frequency ◽  
Ultracold Atoms ◽  
Fermi Gas ◽  
Normal Phase ◽  
Matrix Approximation ◽  
Self Consistent ◽  
Radio Frequency Spectrum ◽  
Unitary Fermi Gas

The contact plays an important role in the study of ultracold atoms. We determine the contact from the high-frequency asymptotic behavior of radio-frequency spectrum for a homogeneous Fermi gas at unitarity in the normal phase. The contact is obtained within the framework of the non-self-consistent T-matrix approximation with particle–hole fluctuation.

MOMENTUM RESOLVED RADIO FREQUENCY SPECTROSCOPY OF A UNITARY FERMI GAS WITH EXTENDED GMB APPROXIMATION

2014 ◽  
Vol 28 (04) ◽  
pp. 1450028 ◽  
Author(s):  
XIAO-XIA RUAN ◽  
HAO GONG ◽  
LONG DU ◽  
YU JIANG ◽  
WEI-MIN SUN ◽  
...  
Keyword(s):  
Radio Frequency ◽  
High Temperature Superconductivity ◽  
Fermi Gas ◽  
Normal Phase ◽  
Matrix Approximation ◽  
Frequency Spectra ◽  
Self Consistent ◽  
Unitary Fermi Gas ◽  
Different Temperatures ◽  
Radio Frequency Spectroscopy

In this paper, the momentum-resolved radio-frequency spectra of a unitary Fermi gas in the normal phase are presented and analyzed on the basis of the framework of the non-self-consistent T-matrix approximation with the extended Gorkov and Melik-Barkhudarov (GMB) approximation. We report the calculated occupied spectral intensity and energy distribution curves for different temperatures above T c . Our results indicate the existence of pseudogap phenomenon which would be helpful for further understanding of the pseudogap in high-temperature superconductivity.

scholarly journals Quantum critical thermal transport in the unitary Fermi gas

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Bernhard Frank ◽  
Wilhelm Zwerger ◽  
Tilman Enss
Keyword(s):  
Thermal Transport ◽  
Fermi Gas ◽  
Unitary Fermi Gas ◽  
Quantum Critical

scholarly journals Equivalence of Dissipative and Dissipationless Dynamics of Interacting Quantum Systems With Its Application to the Unitary Fermi Gas

2021 ◽  
Vol 9 ◽  
Author(s):  
Masaaki Tokieda ◽  
Shimpei Endo
Keyword(s):  
Quantum Dynamics ◽  
Cold Atoms ◽  
Fermi Gas ◽  
Quantum Systems ◽  
Harmonic Potential ◽  
Particle Interactions ◽  
Dissipative Dynamics ◽  
Strongly Interacting ◽  
Unitary Fermi Gas

We analytically study quantum dissipative dynamics described by the Caldirola-Kanai model with inter-particle interactions. We have found that the dissipative quantum dynamics of the Caldirola-Kanai model can be exactly mapped to a dissipationless quantum dynamics under a negative external harmonic potential, even when the particles are strongly interacting. In particular, we show that the mapping is valid for the unitary Fermi gas, which is relevant for cold atoms and nuclear matters.

scholarly journals Cooper Pairing Above the Critical Temperature in a Unitary Fermi Gas

2013 ◽  
Vol 110 (9) ◽  
Author(s):  
Gabriel Wlazłowski ◽  
Piotr Magierski ◽  
Joaquín E. Drut ◽  
Aurel Bulgac ◽  
Kenneth J. Roche
Keyword(s):  
Critical Temperature ◽  
Fermi Gas ◽  
Cooper Pairing ◽  
Unitary Fermi Gas
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