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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Mesoscopic Rydberg Impurity in an Atomic Quantum Gas.

Richard Schmidt1,2, H R Sadeghpour1, E Demler2

  • 1ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|March 26, 2016
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Summary
This summary is machine-generated.

Giant Rydberg excitations reveal quantum dynamics. A new theory shows a spectral shift from molecular lines to broad distributions as few-body dynamics transition to many-body behavior in ultracold Bose gases.

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Area of Science:

  • Quantum physics
  • Ultracold atomic gases
  • Many-body dynamics

Background:

  • Giant impurity excitations probe quantum systems far from equilibrium.
  • Rydberg excitations in ultracold atoms are key to studying correlations.
  • Recent experimental advances motivate new theoretical approaches.

Purpose of the Study:

  • Develop a theoretical framework for multiscale dynamics of Rydberg excitations in quantum Bose gases.
  • Investigate the crossover from few-body to many-body dynamics.
  • Identify spectral signatures of this crossover.

Main Methods:

  • Theoretical modeling of Rydberg excitations.
  • Analysis of spectral profiles in quantum Bose gases.
  • Investigating temperature and density dependence.

Main Results:

  • A dramatic spectral change is observed during the few- to many-body dynamics crossover.
  • Resolved molecular lines transform into broad Gaussian distributions.
  • A superpolaronic state emerges where many atoms bind to the Rydberg impurity.

Conclusions:

  • The spectral profile change signifies the transition from few- to many-body dynamics.
  • The superpolaronic state is a key feature of this crossover.
  • Temperature and density dependence provide experimental signatures for this phenomenon.