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Mingyuan Sun1, Hui Zhai1,2, Xiaoling Cui3

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|July 22, 2017
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Area of Science:

  • Quantum physics
  • Many-body systems
  • Few-body physics

Background:

  • Bose polarons are quasiparticles of an impurity interacting with surrounding bosons.
  • Efimov physics, characterized by a sequence of bound states, is known in few-body systems but not observed in Bose polarons.
  • Previous spectroscopy measurements have not shown signatures of Efimov physics in Bose polaron systems.

Purpose of the Study:

  • To propose a method for observing Efimov physics signatures in Bose polaron systems.
  • To investigate the role of mass imbalance between impurity and bosons.
  • To determine the impurity self-energy and spectral function using theoretical calculations.

Main Methods:

  • Utilizing a diagrammatic approach within the virial expansion.
  • Incorporating three-body effects from pair-wise interactions.
  • Calculating the impurity self-energy and spectral function.

Main Results:

  • A large mass imbalance between a light impurity and heavy bosons can lead to visible Efimov physics signatures.
  • Two distinct Efimov branches were identified in the polaron spectrum for the ^{6}Li-^{133}Cs system.
  • Observed hybridization between Efimov branches and the attractive polaron branch.

Conclusions:

  • The proposed method enables the observation of Efimov physics in Bose polaron systems.
  • Mass imbalance is a key factor for revealing these few-body correlations in many-body systems.
  • This research opens avenues for future experimental exploration of few-body physics in Bose polarons.