Complex-valued in-medium potential between heavy impurities in ultracold atoms
We formulate the induced potential in a finite-temperature cold-atomic medium between two heavy impurities, or polarons, which is shown to be complex valued in general. The imaginary part of the complex-valued potential describes a decoherence effect, and thus the resulting Schrödinger equation for...
Gespeichert in:
| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
3 September, 2024
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| In: |
Physical review
Year: 2024, Jahrgang: 110, Heft: 3, Pages: 1-14 |
| ISSN: | 2469-9934 |
| DOI: | 10.1103/PhysRevA.110.033304 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.110.033304 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.110.033304 
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| Verfasserangaben: | Yukinao Akamatsu, Shimpei Endo, Keisuke Fujii, Masaru Hongo |
MARC
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| 245 | 1 | 0 | |a Complex-valued in-medium potential between heavy impurities in ultracold atoms |c Yukinao Akamatsu, Shimpei Endo, Keisuke Fujii, Masaru Hongo |
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| 520 | |a We formulate the induced potential in a finite-temperature cold-atomic medium between two heavy impurities, or polarons, which is shown to be complex valued in general. The imaginary part of the complex-valued potential describes a decoherence effect, and thus the resulting Schrödinger equation for the two polarons acquires a non-Hermitian term. We apply the developed formulation to two representative cases of polarons interacting with medium particles through the -wave contact interaction: (i) the normal phase of single-component (i.e., spin-polarized) fermions using the fermionic field theory and (ii) a superfluid phase using the superfluid effective field theory, which is valid either for a Bose-Einstein condensate (BEC) of a single-component Bose gas or for the BEC-BCS crossover in two-component fermions at a low-energy regime. Computing the leading-order term, the imaginary part of the potential in both cases is found to show a universal −2 behavior at long distance. We propose three experimental ways to observe the effects of the universal imaginary potential in cold atoms. | ||
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| 700 | 1 | |a Fujii, Keisuke |d 1993- |e VerfasserIn |0 (DE-588)1258798999 |0 (DE-627)1805325914 |4 aut | |
| 700 | 1 | |a Hongo, Masaru |e VerfasserIn |4 aut | |
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