Quantum Turbulence in a Trapped Bose-Einstein Condensate under Combined Rotations around Three Axes

2007 ◽  
Vol 150 (3-4) ◽  
pp. 587-592 ◽  
Author(s):  
M. Kobayashi ◽  
M. Tsubota
Keyword(s):  
Quantum Turbulence ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Entropy of a Turbulent Bose-Einstein Condensate

Entropy ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 956 ◽  
Author(s):  
Lucas Madeira ◽  
Arnol Daniel García-Orozco ◽  
Francisco Ednilson Alves dos Santos ◽  
Vanderlei Salvador Bagnato
Keyword(s):  
Quantum Turbulence ◽  
Excitation Amplitude ◽  
Einstein Condensate ◽  
Quantum Fluids ◽  
Sudden Increase ◽  
Bose Einstein Condensate ◽  
Onset Of Turbulence ◽  
Bose Einstein ◽  
Distinct Features ◽  
Made In

Quantum turbulence deals with the phenomenon of turbulence in quantum fluids, such as superfluid helium and trapped Bose-Einstein condensates (BECs). Although much progress has been made in understanding quantum turbulence, several fundamental questions remain to be answered. In this work, we investigated the entropy of a trapped BEC in several regimes, including equilibrium, small excitations, the onset of turbulence, and a turbulent state. We considered the time evolution when the system is perturbed and let to evolve after the external excitation is turned off. We derived an expression for the entropy consistent with the accessible experimental data, which is, using the assumption that the momentum distribution is well-known. We related the excitation amplitude to different stages of the perturbed system, and we found distinct features of the entropy in each of them. In particular, we observed a sudden increase in the entropy following the establishment of a particle cascade. We argue that entropy and related quantities can be used to investigate and characterize quantum turbulence.

scholarly journals A method to create disordered vortex arrays in atomic Bose–Einstein condensates

2009 ◽  
Vol 87 (9) ◽  
pp. 1013-1019 ◽  
Author(s):  
Enikö J.M. Madarassy
Keyword(s):  
Wave Function ◽  
Quantum Turbulence ◽  
Einstein Condensate ◽  
Complex Conjugate ◽  
Pitaevskii Equation ◽  
Two Dimensional ◽  
Bose Einstein Condensate ◽  
Phase Profile ◽  
Bose Einstein

We suggest a method to create quantum turbulence (QT) in a trapped atomic Bose–Einstein condensate (BEC). By replacing in the upper half of our box the wave function, Ψ, with its complex conjugate, Ψ*, new negative vortices are introduced into the system. The simulations are performed by solving the two-dimensional Gross–Pitaevskii equation (2D GPE). We study the successive dynamics of the wave function by monitoring the evolution of density and phase profile.

scholarly journals Quantum turbulence by vortex stirring in a spinor Bose-Einstein condensate

2014 ◽  
Vol 89 (3) ◽  
Author(s):  
B. Villaseñor ◽  
R. Zamora-Zamora ◽  
D. Bernal ◽  
V. Romero-Rochín
Keyword(s):  
Quantum Turbulence ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Characteristic Length Scale during the Time Evolution of a Turbulent Bose–Einstein Condensate

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1865
Author(s):  
Lucas Madeira ◽  
Arnol D. García-Orozco ◽  
Michelle A. Moreno-Armijos ◽  
Francisco Ednilson Alves dos dos Santos ◽  
Vanderlei S. Bagnato
Keyword(s):  
Time Evolution ◽  
Quantum Turbulence ◽  
Characteristic Length ◽  
Three Dimensional ◽  
Einstein Condensate ◽  
Length Scale ◽  
Characteristic Length Scale ◽  
Bose Einstein Condensate ◽  
Momentum Distributions ◽  
Bose Einstein

Quantum turbulence is characterized by many degrees of freedom interacting non-linearly to produce disordered states, both in space and in time. In this work, we investigate the decaying regime of quantum turbulence in a trapped Bose–Einstein condensate. We present an alternative way of exploring this phenomenon by defining and computing a characteristic length scale, which possesses relevant characteristics to study the establishment of the quantum turbulent regime. We reconstruct the three-dimensional momentum distributions with the inverse Abel transform, as we have done successfully in other works. We present our analysis with both the two- and three-dimensional momentum distributions, discussing their similarities and differences. We argue that the characteristic length allows us to intuitively visualize the time evolution of the turbulent state.

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