2017/03/03 by Miki Ota, Hiroyuki Tajima, Ryo Hanai +2 · 19 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Crossover #Electron #Fermi Gamma-ray Space Telescope #Fermi gas #Fermi level #Pairing #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Spectral line #Superconductivity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.95.053623
published in Physical Review A 95(5) (American Physical Society) · 21 pages, 9 figures
arxiv created 2017/03/03 · openalex publication_date 2017/05/22 · arxiv updated 2017/05/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We theoretically investigate single-particle excitations in the BCS-BEC-crossover regime of an ultracold Fermi gas. Including strong pairing fluctuations within a T-matrix approximation, as well as effects of a harmonic trap potential in the local-density approximation, we calculate the local photoemission spectrum in the normal state. Recently, the JILA group measured this quantity in a 40K Fermi gas in order to examine homogeneous single-particle properties of this system. Comparing our results with this experiment, we show that this attempt indeed succeeds under JILA's experimental condition. However, we also find that the current local photoemission spectroscopy still has room for improvement in order to examine the pseudogap phenomenon predicted in the BCS-BEC-crossover region. Since ultracold Fermi gases are always in a trap, our results would be useful in applying this system to various homogeneous Fermi systems as a quantum simulator.