| Autor: |
Jäger M; Institut für Quantenmaterie and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Albert-Einstein-Allee 45, 89081 Ulm, Germany., Denschlag JH; Institut für Quantenmaterie and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Albert-Einstein-Allee 45, 89081 Ulm, Germany. |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2024 Jun 28; Vol. 132 (26), pp. 263401. |
| DOI: |
10.1103/PhysRevLett.132.263401 |
| Abstrakt: |
We study two-body correlations in a spin-balanced ultracold harmonically trapped Fermi gas of ^{6}Li atoms in the crossover from the Bardeen-Cooper-Schrieffer (BCS) to the Bose-Einstein-Condensate (BEC) regime. For this, we precisely measure Tan's contact using a novel method based on photoexcitation of atomic pairs, which was recently proposed by Wang et al. [Photoexcitation measurement of Tan's contact for a strongly interacting Fermi gas, Phys. Rev. A 104, 063309 (2021).PLRAAN2469-992610.1103/PhysRevA.104.063309]. We map out the contact in the entire phase diagram of the BCS-BEC crossover for various temperatures and interaction strengths, probing regions in phase space that have not been investigated yet. Our measurements reach an uncertainty of ≈2% at the lowest temperatures and thus represent a precise quantitative benchmark. By comparison to our data, we localize the regions in phase space where theoretical predictions and interpolations give valid results. In regions where the contact is already well known we find excellent agreement with our measurements. Thus, our results demonstrate that photoinduced loss is a precise probe to measure quantum correlations in a strongly interacting Fermi gas. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
