One-dimensional Fermi polaron in a combined harmonic and periodic potential

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2014-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
1-6
Series
PHYSICAL REVIEW A, Volume 89, issue 5
Abstract
We study an impurity in a one-dimensional potential consisting of a harmonic part and a periodic part using both the time-evolving block decimation (TEBD) algorithm and a variational ansatz. Attractive and repulsive contact interactions with a sea of fermions are considered. We find excellent agreement between TEBD and variational results and use the variational ansatz to investigate higher lattice bands. We conclude that the lowest band approximation fails at sufficiently strong interactions and develop a method for computing the Tan contact parameter.
Description
Keywords
Hubbard model, impurities, Tan contact, tight-binding approximation, ultracold gases
Other note
Citation
Doggen , E V H , Korolyuk , A , Törmä , P & Kinnunen , J J 2014 , ' One-dimensional Fermi polaron in a combined harmonic and periodic potential ' , Physical Review A , vol. 89 , no. 5 , 053621 , pp. 1-6 . https://doi.org/10.1103/PhysRevA.89.053621