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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Bose-Einstein condensates in strongly disordered traps.

T Nattermann1, V L Pokrovsky

  • 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany. natter@thp.uni-koeln.de

Physical Review Letters
|March 21, 2008
PubMed
Summary
This summary is machine-generated.

We theoretically studied Bose-Einstein condensates in combined harmonic and random potentials. Strong disorder causes condensates to fragment into stable pieces of Larkin length size, affecting breathing mode frequencies.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Bose-Einstein condensates (BECs) exhibit unique quantum phenomena.
  • Understanding BEC behavior in complex potentials is crucial for quantum technologies.

Purpose of the Study:

  • To theoretically investigate Bose-Einstein condensates in potentials combining harmonic and random elements.
  • To analyze how disorder strength affects condensate properties like size, shape, and excitation energy.

Main Methods:

  • Theoretical analysis of a Bose-Einstein condensate.
  • Semiquantitative analysis of condensate properties under varying disorder strengths.
  • Examination of condensate fragmentation and stability.

Main Results:

  • Condensates fragment into pieces of Larkin length (L) under strong disorder and positive scattering length.
  • These fragmented states are stable across a wide range of particle numbers.
  • Breathing mode frequency scales inversely with the square of the Larkin length (1/L^2).
  • For negative scattering length, a condensate of size L can exist as a metastable state.

Conclusions:

  • Disorder significantly alters Bose-Einstein condensate structure and dynamics.
  • The Larkin length emerges as a critical parameter for fragmented condensates.
  • Findings are generalizable to anisotropic trap potentials.