Excitations of a Superfluid in a Three-Dimensional Optical Lattice

2004/08/31 by C. Schori, Christian Schori, Thilo Stöferle +3 · 125 citations
Chemistry · Physics and Astronomy · #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Excitation #Feshbach resonance #Lattice (music) #Molecule #Optical lattice #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Spectroscopy and Laser Applications #Superfluidity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.93.240402

published in Physical Review Letters 93(24), 240402 (American Physical Society) · 4 pages, 4 figures

openalex publication_date 2004/12/06 · arxiv created 2004/12/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We prepare a Bose-Einstein condensed gas in a three-dimensional optical lattice and study the excitation spectrum of the superfluid phase for different interaction strengths. We probe the response of the system by modulating the depth of the optical lattice along one axis. The interactions can be controlled independently by varying the tunnel coupling along the other two lattice axes. In the weakly interacting regime we observe a small susceptibility of the superfluid to excitations, while for stronger interactions an unexpected resonance appears in the excitation spectrum. In addition we measure the coherent fraction of the atomic gas, which determines the depletion of the condensate.

Citations

• Transition from a Strongly Interacting 1D Superfluid to a Mott Insulator
• Josephson Junction Arrays with Bose-Einstein Condensates
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Exciting Collective Oscillations in a Trapped 1D Gas
• Interference of an Array of Independent Bose-Einstein Condensates
• Bose-Einstein condensates in 1D optical lattices

Cited by

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• Momentum-resolved optical lattice modulation spectroscopy for bosons in optical lattices
• Time-dependent local potential in a Tomonaga-Luttinger liquid
• Sodium Bose-Einstein condensates in an optical lattice
• Excitations of Bose-Einstein condensates in a one-dimensional periodic potential
• Metastable Bose-Einstein condensation in a strongly correlated optical lattice
• Evidence of Potts-Nematic Superfluidity in a Hexagonal sp2 Optical Lattice
• Theory of ultracold superstrings