The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations

Details The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations

2008-01-09

arxiv.org/abs/0801.1504v4

Phys. Rev. Lett. 103, 210403 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures. Published version

Scientific paper

10.1103/PhysRevLett.103.210403

We calculate the one-body temperature Green's (Matsubara) function of the unitary Fermi gas via Quantum Monte Carlo, and extract the spectral weight function $A(p,\omega)$ using the methods of maximum entropy and singular value decomposition. From $A(p,\omega)$ we determine the quasiparticle spectrum, which can be accurately parametrized by three functions of temperature: an effective mass $m^*$, a mean-field potential $U$, and a gap $\Delta$. Below the critical temperature $T_c=0.15\varepsilon_F$ the results for $m^*$, $U$ and $\Delta$ can be accurately reproduced using an independent quasiparticle model. We find evidence of a pseudogap in the fermionic excitation spectrum for temperatures up to {$T^*\approx 0.20\varepsilon_{F} > T_c$}.

Affiliated with

Also associated with

No associations

Rating

The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-435865