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Collective Motional Temperature
Sohila Abdelhafiz1,2, Amir M Jazayeri1, Aristide Dogariu1
1CREOL, The College of Optics and Photonics, University of Central Florida, 4304 Scorpius Street, Orlando, Florida 32816, United States.
ACS Omega
|May 25, 2026
Summary
We introduce collective motional temperature in interacting nanoparticles. Heating and cooling times are unequal, influenced by optical fields and gravity, impacting many-body dynamics.
Area of Science:
- Soft Matter Physics
- Nanoparticle Dynamics
- Non-equilibrium Systems
Background:
- Understanding collective behavior in dense nanoparticle systems is crucial for many-body physics.
- Nonequilibrium phenomena in dynamic systems require high spatial and temporal resolution.
- Interacting nanoparticles are influenced by external fields and their own optical modifications.
Purpose of the Study:
- Introduce and analyze the time evolution of collective motional temperature.
- Investigate the role of gravity and optical fields on nanoparticle systems.
- Examine heating and cooling dynamics in interacting many-body systems.
Main Methods:
- Experimental approach with high spatial and temporal resolution.
- Study of a dense colloidal medium under gravity and an external optical field.
- Analysis of nanoparticle interactions mediated by a dynamically modified optical field.
Main Results:
- Particle number density is primarily affected by gravity and radiation pressure.
- Collective motional temperature is determined by the dynamic optical speckle field.
- Effective heating and cooling times are unequal for interacting many-body systems, similar to isolated particles.
- Collective motional temperature shows dependence on the external optical field intensity.
Conclusions:
- Collective motional temperature is a key parameter in dense nanoparticle systems.
- Asymmetric heating and cooling dynamics are characteristic of interacting many-body systems.
- External optical field intensity is a critical factor in controlling nanoparticle temperature.
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