• DOI:10.1103/PhysRevLett.118.095301
• Corpus ID: 5190749

Quasiparticle Approach to Molecules Interacting with Quantum Solvents.

@article{Lemeshko2017QuasiparticleAT,
  title={Quasiparticle Approach to Molecules Interacting with Quantum Solvents.},
  author={Mikhail Lemeshko},
  journal={Physical review letters},
  year={2017},
  volume={118 9},
  pages={
          095301
        }
}

• M. Lemeshko
• Published 5 October 2016
• Physics
• Physical review letters

Understanding the behavior of molecules interacting with superfluid helium represents a formidable challenge and, in general, requires approaches relying on large-scale numerical simulations. Here, we demonstrate that experimental data collected over the last 20 years provide evidence that molecules immersed in superfluid helium form recently predicted angulon quasiparticles [Phys. Rev. Lett. 114, 203001 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.203001]. Most important, casting the many-body problem in terms of angulons amounts to a drastic simplification and yields effective molecular moments of inertia as straightforward analytic solutions of a simple microscopic Hamiltonian. The outcome of the angulon theory is in good agreement with experiment for a broad range of molecular impurities, from heavy to medium-mass to light species. These results pave the way to understanding molecular rotation in liquid and crystalline phases in terms of the angulon quasiparticle.