2009/01/13 by N. Fabbri, Nicole Fabbri, David Clément +7
Physics and Astronomy · #Amplitude #Atomic physics #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Excitation #Lattice (music) #Optical lattice #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Spectroscopy #Strong Light-Matter Interactions #Superfluidity #cond-mat.other
paper · pdf · doi:10.1103/physreva.79.043623
published as Phys. Rev. A 79, 043623 (2009) · 5 pages, 4 figures
arxiv created 2009/01/13 · openalex publication_date 2009/04/23 · arxiv updated 2015/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on the experimental investigation of the response of a three-dimensional Bose-Einstein condensate (BEC) in the presence of a one-dimensional (1D) optical lattice. By means of Bragg spectroscopy we probe the band structure of the excitation spectrum in the presence of the periodic potential. We selectively induce elementary excitations of the BEC choosing the transferred momentum and we observe different resonances in the energy transfer, corresponding to the transitions to different bands. The frequency, the width, and the strength of these resonances are investigated as functions of the amplitude of the 1D optical lattice.