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Quantum Ferrofluid Turbulence.
T Bland1, G W Stagg1, L Galantucci1
1Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.
Physical Review Letters
|November 10, 2018
Summary
Researchers explored quantum turbulence in a dipolar Bose gas, finding that dipolar interactions create polarized turbulence and density patterns. Vortex lines form in low-density areas, enhancing decay and offering new ways to control turbulence with magnetic fields.
Area of Science:
- Quantum physics
- Fluid dynamics
- Condensed matter physics
Background:
- Turbulence in quantum systems is not fully understood.
- Bose gases provide a platform to study quantum phenomena.
- Dipolar interactions introduce unique characteristics to quantum fluids.
Purpose of the Study:
- To investigate the fundamental properties of turbulence in a quantum ferrofluid.
- To understand the role of dipolar interactions in turbulent behavior.
- To explore the potential for controlling quantum turbulence.
Main Methods:
- Simulations of a dipolar Bose gas condensing from a nonequilibrium thermal state.
- Analysis of vortex line dynamics and density fluctuations.
- Examination of the impact of interaction signs on turbulence.
Main Results:
- Dipolar interactions induce polarized turbulence and density corrugations.
- Superfluid vortex lines and density fluctuations exhibit columnar or stratified configurations based on interaction sign.
- Vortices preferentially form in low-density regions to minimize kinetic energy.
- Dominantly dipolar interactions enhance vortex line length decay, following a t^{-3/2} behavior.
Conclusions:
- Quantum ferrofluids exhibit unique turbulent characteristics driven by dipolar interactions.
- The system allows for the realization of stratified quantum turbulence.
- Magnetic fields can be used to generate and control this type of turbulence.
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