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Title: Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate

Abstract

For quantum fluids, the role of quantum fluctuations may be significant in several regimes such as when the dimensionality is low, the density is high, the interactions are strong, or for low particle numbers. In this paper, we propose a fundamentally different regime for enhanced quantum fluctuations without being restricted by any of the above conditions. Instead, our scheme relies on the engineering of an effective attractive interaction in a dilute, two-component Bose-Einstein condensate (BEC) consisting of thousands of atoms. In such a regime, the quantum spin fluctuations are significantly enhanced (atom bunching with respect to the noninteracting limit) since they act to reduce the interaction energy, a remarkable property given that spin fluctuations are normally suppressed (antibunching) at zero temperature. In contrast to the case of true attractive interactions, our approach is not vulnerable to BEC collapse. Here, we numerically demonstrate that these quantum fluctuations are experimentally accessible by either spin or single-component Bragg spectroscopy, offering a useful platform on which to test beyond-mean-field theories. We also develop a variational model and use it to analytically predict the shift of the immiscibility critical point, finding good agreement with our numerics.

Authors:
 [1]; ORCiD logo [2];  [3]
  1. Univ. di Trento, Povo (Italy). Center and Dipt. di Fisica
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mathematics and Statistics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1492663
Alternate Identifier(s):
OSTI ID: 1419098
Report Number(s):
LA-UR-17-30429
Journal ID: ISSN 2469-9926
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Bisset, Russell N., Ticknor, Christopher, and Kevrekidis, Panos G. Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate. United States: N. p., 2018. Web. doi:10.1103/PhysRevA.97.023602.
Bisset, Russell N., Ticknor, Christopher, & Kevrekidis, Panos G. Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate. United States. doi:10.1103/PhysRevA.97.023602.
Bisset, Russell N., Ticknor, Christopher, and Kevrekidis, Panos G. Thu . "Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate". United States. doi:10.1103/PhysRevA.97.023602. https://www.osti.gov/servlets/purl/1492663.
@article{osti_1492663,
title = {Enhanced quantum spin fluctuations in a binary Bose-Einstein condensate},
author = {Bisset, Russell N. and Ticknor, Christopher and Kevrekidis, Panos G.},
abstractNote = {For quantum fluids, the role of quantum fluctuations may be significant in several regimes such as when the dimensionality is low, the density is high, the interactions are strong, or for low particle numbers. In this paper, we propose a fundamentally different regime for enhanced quantum fluctuations without being restricted by any of the above conditions. Instead, our scheme relies on the engineering of an effective attractive interaction in a dilute, two-component Bose-Einstein condensate (BEC) consisting of thousands of atoms. In such a regime, the quantum spin fluctuations are significantly enhanced (atom bunching with respect to the noninteracting limit) since they act to reduce the interaction energy, a remarkable property given that spin fluctuations are normally suppressed (antibunching) at zero temperature. In contrast to the case of true attractive interactions, our approach is not vulnerable to BEC collapse. Here, we numerically demonstrate that these quantum fluctuations are experimentally accessible by either spin or single-component Bragg spectroscopy, offering a useful platform on which to test beyond-mean-field theories. We also develop a variational model and use it to analytically predict the shift of the immiscibility critical point, finding good agreement with our numerics.},
doi = {10.1103/PhysRevA.97.023602},
journal = {Physical Review A},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

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