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Rotational Doppler cooling and heating.

Deng Pan1, Hongxing Xu2, F Javier García de Abajo1,3

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain. deng.pan@icfo.eu javier.garciadeabajo@nanophotonics.es.

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Rotational Doppler cooling and heating manipulate nanosystem rotation using laser light. Particle shape significantly impacts these effects, enabling new optical control possibilities for rotational motion.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Quantum Physics

Background:

  • Doppler cooling utilizes the Doppler shift for laser cooling of atoms, molecules, and nanoparticles.
  • The rotational Doppler effect offers a potential mechanism for optical manipulation of nanosystem rotational motion.

Purpose of the Study:

  • To investigate the physics of rotational Doppler cooling and heating (RDC and RDH) in nanosystems.
  • To explore the dependence of RDC and RDH effects on particle morphology and laser detuning.
  • To predict novel phenomena such as optomechanical spontaneous chiral symmetry breaking.

Main Methods:

  • Theoretical analysis of the rotational Doppler effect applied to nanosystems.
  • Modeling of different particle morphologies (geometrically constrained vs. solid-like).
  • Simulation of laser-matter interactions involving rotational degrees of freedom.

Main Results:

  • Observed morphology-dependent RDC and RDH effects.
  • Identified distinct cooling/heating behaviors for constrained versus solid-like particles based on laser detuning.
  • Predicted spontaneous chiral symmetry breaking in achiral particles under specific illumination conditions.

Conclusions:

  • Rotational Doppler effects present rich, unexplored physics with strong dependence on particle morphology.
  • Tailored laser illumination can control the rotational motion of nanosystems, leading to cooling or heating.
  • RDH offers pathways for inducing spontaneous chiral symmetry breaking and advanced optical manipulation of nanoscale rotation.