2009/07/31 by Ana María Rey, A. M. Rey, Alexey V. Gorshkov +3
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #cond-mat.quant-gas #cond-mat.str-el #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physrevlett.103.260402
published as Phys. Rev. Lett. 103, 260402 (2009) · 5 pages, 3 figures. V2: added 1 reference
arxiv created 2009/08/26 · openalex publication_date 2009/12/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recent experiments have measured collisional frequency shifts in polarized fermionic alkaline-earth atoms using 1S0-3P0 Rabi spectroscopy. Here, we provide a first-principles nonequilibrium theoretical description of the interaction frequency shifts starting from the microscopic many-body Hamiltonian. Our formalism describes the dependence of the frequency shift on excitation inhomogeneity, interactions, temperature, and many-body dynamics, provides a fundamental understanding of the effects of the measurement process, and explains the observed density shift data.