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Nanoscale "Dark State" Optical Potentials for Cold Atoms.

M Łącki1,2, M A Baranov1,2, H Pichler1,2,3,4

  • 1Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria.

Physical Review Letters
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

We demonstrate subwavelength optical barriers for cold atoms, creating conservative potentials from quantum effects. These barriers form an optical Kronig-Penney model, enabling detailed band structure studies.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics
  • Condensed Matter Theory

Background:

  • Cold atoms are manipulated using optical potentials for quantum simulations.
  • Standard Born-Oppenheimer potentials neglect nonadiabatic effects crucial at the nanoscale.
  • Atomic Λ configurations with dressed dark states offer novel potential landscapes.

Purpose of the Study:

  • To investigate the generation of subwavelength optical barriers for cold atoms.
  • To explore these barriers as conservative optical potentials analogous to a Kronig-Penney model.
  • To analyze the band structure and decoherence effects in such potentials.

Main Methods:

  • Utilizing nonadiabatic corrections to Born-Oppenheimer potentials.
  • Employing dressed "dark states" in atomic Λ configurations.
  • Constructing a double-layer potential by inserting a subwavelength barrier into an optical lattice well.
  • Analyzing band structure and decoherence from spontaneous emission and atom loss.

Main Results:

  • Successfully generated subwavelength optical barriers (tens of nanometers) for cold atoms.
  • Demonstrated these barriers form an optical Kronig-Penney potential.
  • Studied bound states of atom pairs interacting via magnetic dipolar forces.
  • Presented a detailed band structure analysis, including decoherence effects.

Conclusions:

  • Subwavelength optical barriers are viable conservative potentials for cold atoms.
  • The optical Kronig-Penney model provides a framework for studying quantum phenomena in these potentials.
  • Decoherence mechanisms like spontaneous emission and atom loss are critical considerations for practical applications.