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From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time

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arxiv 1307.3443 v2 pith:HKX7JX7N submitted 2013-07-12 cond-mat.quant-gas

From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time

classification cond-mat.quant-gas
keywords atomsinteractionmajoritymany-bodynumberenergyfermiimpurity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Knowing when a physical system has reached sufficient size for its macroscopic properties to be well described by many-body theory is difficult. We investigate the crossover from few to many-body physics by studying quasi one-dimensional systems of ultracold atoms consisting of a single impurity interacting with an increasing number of identical fermions. We measure the interaction energy of such a system as a function of the number of majority atoms for different strengths of the interparticle interaction. As we increase the number of majority atoms one by one we observe the fast convergence of the normalized interaction energy towards a many-body limit calculated for a single impurity immersed in a Fermi sea of majority particles.

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  1. Few is different: deciphering many-body dynamics in mesoscopic quantum gases

    cond-mat.quant-gas 2025-09 unverdicted novelty 3.0

    A workshop report mapping the size, equilibrium, and interaction frontiers of hydrodynamic behavior in mesoscopic quantum systems, connecting few-atom Fermi gases and high-energy small collision systems.