Details
| Original language | English |
|---|---|
| Article number | 250402 |
| Journal | Physical review letters |
| Volume | 128 |
| Issue number | 25 |
| Publication status | Published - 22 Jun 2022 |
Abstract
We probe local phase fluctuations of trapped two-dimensional Bose gases using matter-wave interferometry. This enables us to measure the phase correlation function, which changes from an algebraic to an exponential decay when the system crosses the Berezinskii-Kosterlitz-Thouless (BKT) transition. We determine the temperature dependence of the BKT exponent η and find the critical value ηc=0.17(3) for our trapped system. Furthermore, we measure the local vortex density as a function of the local phase-space density, which shows a scale-invariant behavior across the transition. Our experimental investigation is supported by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.
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In: Physical review letters, Vol. 128, No. 25, 250402, 22.06.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Observation of the Berezinskii-Kosterlitz-Thouless Transition in a Two-Dimensional Bose Gas via Matter-Wave Interferometry
AU - Sunami, S.
AU - Singh, V. P.
AU - Garrick, D.
AU - Beregi, A.
AU - Barker, A. J.
AU - Luksch, K.
AU - Bentine, E.
AU - Mathey, L.
AU - Foot, C. J.
N1 - Funding Information: We acknowledge discussions with Junichi Okamoto, Beilei Zhu, and Zoran Hadzibabic. This work was supported by the EPSRC Grant Reference EP/S013105/1. S. S. acknowledges the Murata scholarship foundation, Ezoe Foundation, Daishin Foundation, and St Hilda’s College for financial support. D. G., A. B., A. J. B., and K. L. thank the EPSRC for doctoral training funding. L. M. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG) in the framework of SFB 925—project ID 170620586 and the Excellence Cluster “Advanced Imaging of Matter”—EXC 2056—project ID 390715994. V. P. S. acknowledges funding by the Cluster of Excellence “QuantumFrontiers”—EXC 2123—project ID 390837967.
PY - 2022/6/22
Y1 - 2022/6/22
N2 - We probe local phase fluctuations of trapped two-dimensional Bose gases using matter-wave interferometry. This enables us to measure the phase correlation function, which changes from an algebraic to an exponential decay when the system crosses the Berezinskii-Kosterlitz-Thouless (BKT) transition. We determine the temperature dependence of the BKT exponent η and find the critical value ηc=0.17(3) for our trapped system. Furthermore, we measure the local vortex density as a function of the local phase-space density, which shows a scale-invariant behavior across the transition. Our experimental investigation is supported by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.
AB - We probe local phase fluctuations of trapped two-dimensional Bose gases using matter-wave interferometry. This enables us to measure the phase correlation function, which changes from an algebraic to an exponential decay when the system crosses the Berezinskii-Kosterlitz-Thouless (BKT) transition. We determine the temperature dependence of the BKT exponent η and find the critical value ηc=0.17(3) for our trapped system. Furthermore, we measure the local vortex density as a function of the local phase-space density, which shows a scale-invariant behavior across the transition. Our experimental investigation is supported by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.
UR - http://www.scopus.com/inward/record.url?scp=85133526251&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.128.250402
DO - 10.1103/PhysRevLett.128.250402
M3 - Article
VL - 128
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 25
M1 - 250402
ER -