利用噪声相关性检测二维玻色气体的相位相干性

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-05-08 DOI:10.1103/physrevlett.134.183407

Shinichi Sunami, Vijay P. Singh, Erik Rydow, Abel Beregi, En Chang, Ludwig Mathey, Christopher J. Foot

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引用次数: 0

摘要

我们测量了自由膨胀后二维（2D）玻色气体的噪声相关性，并用它们来表征Berezinskii-Kosterlitz-Thouless （BKT）跃迁中的相相干性。噪声相关函数在超流相中具有明显的空间振荡特性，可以直接得到超流指数。正如我们在单层和去耦双层二维玻色气体中所证明的那样，这种振荡行为在BKT临界点以上消失。本文建立了噪声干涉测量法作为探测和识别量子气体多体态的重要通用工具，将其应用扩展到多模系统中以前无法获得的相关特性。2025年由美国物理学会出版

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Detecting Phase Coherence of 2D Bose Gases via Noise Correlations

We measure the noise correlations of two-dimensional (2D) Bose gases after free expansion and use them to characterize the phase coherence across the Berezinskii-Kosterlitz-Thouless (BKT) transition. The noise correlation function features a characteristic spatial oscillatory behavior in the superfluid phase, which gives direct access to the superfluid exponent. This oscillatory behavior vanishes above the BKT critical point, as we demonstrate for both single-layer and decoupled bilayer 2D Bose gases. Our Letter establishes noise interferometry as an important general tool to probe and identify many-body states of quantum gases, extending its application to previously inaccessible correlation properties in multimode systems.

Published by the American Physical Society

2025

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks