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Vortex chain in a resonantly pumped polariton superfluid
T Boulier1, H Terças2, D D Solnyshkov2
1Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
Scientific Reports
|March 19, 2015
Summary
Researchers created a ring of vortices in an exciton-polariton superfluid by injecting angular momentum. These vortices rearranged based on density, demonstrating superfluid behavior and hydrodynamic instabilities.
Area of Science:
- Quantum optics
- Condensed matter physics
- Light-matter interactions
Background:
- Exciton-polaritons are hybrid light-matter quasiparticles.
- They offer a unique platform for studying quantum fluids out-of-equilibrium.
- Quantum fluids exhibit properties like superfluidity and quantized vortices.
Purpose of the Study:
- To investigate the formation and behavior of vortices in an exciton-polariton superfluid.
- To explore the role of angular momentum injection in creating vortex structures.
- To study the dynamics and stability of these vortices under nonlinear conditions.
Main Methods:
- Excitation of an exciton-polariton gas using optical techniques.
- Injection of angular momentum via a Laguerre-Gauss beam (ℓ = 8).
- Observation and analysis of vortex formation and dynamics in the nonlinear regime.
Main Results:
- Formation of a ring-shaped array of same-sign vortices after angular momentum injection.
- Vortices rearranged radially based on local density, minimizing energy while conserving angular momentum.
- Hydrodynamic instabilities led to spontaneous vortex-antivortex pair nucleation in larger systems.
Conclusions:
- Exciton-polariton superfluids exhibit quantized angular momentum and vortex formation.
- Vortex dynamics are governed by nonlinear interactions and energy minimization.
- The system demonstrates key characteristics of quantum fluid behavior, including instabilities.
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