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Spectral function of Fermi polarons at finite temperature from a self-consistent many-body $T$-matrix approach in real frequency
- Source :
- Physical Review A 109, 063313 (2024)
- Publication Year :
- 2023
-
Abstract
- We theoretically examine the finite-temperature spectral function of Fermi polarons in three dimensions, by using a self-consistent many-body $T$-matrix theory in real frequency. In comparison with the previous results from a non-self-consistent many-body $T$-matrix approach, we show that the treatment of self-consistency in the impurity Green function leads to notable changes in almost all the dynamical quantities, including the vertex function, impurity self-energy and spectral function. Eventually, it gives rise to quantitatively different predictions for the measurable radio-frequency spectrum and Raman spectrum at finite temperature. Using the recent spectroscopic measurements as a benchmark, we find that the self-consistent many-body $T$-matrix theory somehow provides a better explanation for the experimental data. The notable difference in the predictions from the non-self-consistent and self-consistent theories suggests that more accurate theoretical descriptions are needed, in order to fully account for the current spectroscopic observations on Fermi polarons.<br />Comment: 12 pages, 13 figures
- Subjects :
- Condensed Matter - Quantum Gases
Subjects
Details
- Database :
- arXiv
- Journal :
- Physical Review A 109, 063313 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2311.11554
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.109.063313