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Niels Jakob Søe Loft

Comparing models for the ground state energy of a trapped one-dimensional Fermi gas with a single impurity

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We discuss the local density approximation approach to calculating the ground state energy of a one-dimensional Fermi gas containing a single impurity, and compare the results with exact numerical values that we have for up to 11 particles for general interaction strengths and up to 30 particles in the strongly interacting case. We also calculate the contact coefficient in the strongly interacting regime. The different theoretical predictions are compared to recent experimental results with few-atom systems. Firstly, we find that the local density approximation suffers from great ambiguity in the few-atom regime, yet it works surprisingly well for some models. Secondly, we find that the strong interaction theories quickly break down when the number of particles increase or the interaction strength decreases.
Original languageEnglish
Article number125305
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Publication statusPublished - 25 May 2016

    Research areas

  • cond-mat.quant-gas, quant-ph

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