用拉姆齐-布拉格干涉测量法探测费米气体中的对相关性

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

SciPost Physics Pub Date : 2024-07-29 DOI:10.21468/scipostphys.17.1.024

Théo Malas-Danzé, Alexandre Dugelay, Nir Navon, Hadrien Kurkjian

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引用次数: 0

摘要

我们提出了一种干涉测量方法，用于探测自旋-$1/2$费米子气体中的对相关性。该方法由拉姆齐序列组成，在该序列中，费米气体的两个自旋态被设置为静止态和具有较大反冲速度态的叠加态。双体密度矩阵是通过转移到反冲态的部分的波动来提取的。在对偶凝聚阶段，对角线外的长程阶直接反映在长探测时间内干涉信号的渐近行为中。该方法还可以探测凝聚对的空间结构：在巴丁-库珀-施里弗机制中，干涉信号是干涉时间的振荡函数；在分子玻色-爱因斯坦凝聚机制中，它变成了过阻尼函数。

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Probing pair correlations in Fermi gases with Ramsey-Bragg interferometry

We propose an interferometric method to probe pair correlations in a gas of spin-$1/2$ fermions. The method consists of a Ramsey sequence where both spin states of the Fermi gas are set in a superposition of a state at rest and a state with a large recoil velocity. The two-body density matrix is extracted via the fluctuations of the transferred fraction to the recoiled state. In the pair-condensed phase, the off-diagonal long-range order is directly reflected in the asymptotic behavior of the interferometric signal for long interrogation times. The method also allows to probe the spatial structure of the condensed pairs: the interferometric signal is an oscillating function of the interrogation time in the Bardeen-Cooper-Schrieffer regime; it becomes an overdamped function in the molecular Bose-Einstein condensate regime.

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来源期刊

SciPost Physics Physics and Astronomy-Physics and Astronomy (all)

CiteScore

8.20

自引率

12.70%

发文量

315

审稿时长

10 weeks

期刊介绍： SciPost Physics publishes breakthrough research articles in the whole field of Physics, covering Experimental, Theoretical and Computational approaches. Specialties covered by this Journal: - Atomic, Molecular and Optical Physics - Experiment - Atomic, Molecular and Optical Physics - Theory - Biophysics - Condensed Matter Physics - Experiment - Condensed Matter Physics - Theory - Condensed Matter Physics - Computational - Fluid Dynamics - Gravitation, Cosmology and Astroparticle Physics - High-Energy Physics - Experiment - High-Energy Physics - Theory - High-Energy Physics - Phenomenology - Mathematical Physics - Nuclear Physics - Experiment - Nuclear Physics - Theory - Quantum Physics - Statistical and Soft Matter Physics.