Universal Early Coarsening of Quenched Bose Gases

Goo, Junhong; Lee, Yangheon; Lim, Yeunhwan; Bae, Dalmin; Rabga, Tenzin; Shin, Yeong Gil

doi:10.1103/physrevlett.128.135701

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…As long as the quench time is shorter than the timescale in which the order parameter grows, the defect formation dynamics is insensitive to the quench rates and yields a constant defect density [49]. Experimentally, deviations from KZM have been observed in ultracold Bose and Fermi gases driven through the normal-to-superfluid phase transition by a rapid quench [32,33,43,50].…”

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confidence: 99%

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Universal Breakdown of Kibble-Zurek Scaling in Fast Quenches across a Phase Transition

2023

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The crossing of a continuous phase transition gives rise to the formation of topological defects described by the Kibble-Zurek mechanism (KZM) in the limit of slow quenches. The KZM predicts a universal power-law scaling of the defect density as a function of the quench time. We focus on the deviations from KZM experimentally observed in rapid quenches and establish their universality. While KZM scaling holds below a critical quench rate, for faster quenches the defect density and the freeze-out time become independent of the quench rate and exhibit a universal power-law scaling with the final value of the control parameter. These predictions are verified in several paradigmatic scenarios in both the classical and quantum domains.

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confidence: 99%

“…Using two-rate driving schemes, first proposed in Ref. [56], the onset of the plateau in recent Bose gas experiments [43] has been attributed to early-time coarsening before the freezeout timescale [50].…”

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confidence: 99%

Universal Breakdown of Kibble-Zurek Scaling in Fast Quenches across a Phase Transition

2023

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“…The cooling speed is controlled by the decrease time of the trap depth, which ranges from 0.8 s to 11 s, resulting in a variable vortex number in the BEC. For our fastest quench, the vortex number exceeds 60 [30,31]. The typical number of atoms in the condensate is approximately N = 9.6 × 10 6 .…”

Section: Experimental Image Datamentioning

confidence: 85%

“…Additionally, resonant imaging techniques allow for direct visualization of quantum vortices in atomic BECs during a time-of-flight (ToF) expansion, where the vortex core size becomes larger than the imaging device's resolution [5][6][7]. Due to these advantages, there has been active research on the properties of quantum vortices in atomic BECs [4,8] as well as investigations of related phenomena such as rotating BECs [3,[9][10][11][12], vortex shedding [13][14][15][16][17], 2D superfluidity [18][19][20][21], turbulence [22][23][24][25][26][27], and spontaneous defect formation [28][29][30][31]. These studies have significantly advanced our understanding of the superfluid physics associated with these intriguing topological defects.…”

Section: Introductionmentioning

confidence: 99%

Vortex detection in atomic Bose–Einstein condensates using neural networks trained on synthetic images

Kim,

Kwon,

Rabga

et al. 2023

Mach. Learn.: Sci. Technol.

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Quantum vortices in atomic Bose-Einstein condensates (BECs) are topological defects characterized by quantized circulation of particles around them. In experimental studies, vortices are commonly detected by time-of-flight imaging, where their density-depleted cores are enlarged. In this work, we describe a machine learning-based method for detecting vortices in experimental BEC images, particularly focusing on turbulent condensates containing irregularly distributed vortices. Our approach employs a convolutional neural network (CNN) trained solely on synthetic simulated images, eliminating the need for manual labeling of the vortex positions as ground truth. We find that the CNN achieves accurate vortex detection in real experimental images, thereby facilitating analysis of large experimental datasets without being constrained by specific experimental conditions. This novel approach represents a significant advancement in studying quantum vortex dynamics and streamlines the analysis process in the investigation of turbulent BECs.

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Kibble-Zurek Mechanism for the Dynamical Ordering Transition

Maegochi

2024

Springer Theses

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Universal Early Coarsening of Quenched Bose Gases

Cited by 12 publications

References 34 publications

Universal Breakdown of Kibble-Zurek Scaling in Fast Quenches across a Phase Transition

Universal Breakdown of Kibble-Zurek Scaling in Fast Quenches across a Phase Transition

Vortex detection in atomic Bose–Einstein condensates using neural networks trained on synthetic images

Kibble-Zurek Mechanism for the Dynamical Ordering Transition

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