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Quantum reflection from a solid surface at normal incidence.

T A Pasquini1, Y Shin, C Sanner

  • 1Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|December 17, 2004
PubMed
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Ultracold atoms exhibit quantum reflection from solid surfaces, a phenomenon explained by the Casimir-Polder potential. This quantum reflection significantly extends atom lifetimes in traps.

Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Surface science

Background:

  • Quantum reflection is a non-classical phenomenon where particles reflect off potential barriers.
  • The Casimir-Polder potential describes the van der Waals interaction between an atom and a macroscopic surface.

Purpose of the Study:

  • To experimentally observe and quantify quantum reflection of ultracold atoms from a solid surface.
  • To investigate the dependence of reflection probability on atomic velocity.
  • To demonstrate the practical application of quantum reflection in extending atomic lifetimes.

Main Methods:

  • Utilized extremely dilute Bose-Einstein condensates of sodium-23 (23Na) atoms.
  • Confined atoms in a weak gravitomagnetic trap and directed them towards a silicon surface.

Related Experiment Videos

  • Measured reflection probabilities for incident velocities ranging from 1-8 mm/s.

    • Main Results:

    • Observed quantum reflection probabilities of up to 20% for incident ultracold atoms.
    • Experimental velocity dependence qualitatively matched theoretical predictions for Casimir-Polder potential.
    • Atoms in a divided harmonic trap showed extended lifetimes due to quantum reflection, implying >50% probability.

    Conclusions:

    • Quantum reflection of ultracold atoms from solid surfaces is experimentally verified.
    • The Casimir-Polder potential accurately describes the observed reflection phenomenon.
    • Quantum reflection offers a method to enhance the coherence time of ultracold atom systems.