Impurity and soliton dynamics in a Fermi gas with nearest-neighbor interactions

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  • University of Geneva


We study spinless fermions with repulsive nearest-neighbor interactions perturbed by an impurity particle or a local potential quench. Using the numerical time-evolving block decimation method and a simplified analytic model, we show that the perturbations create a soliton-antisoliton pair. If solitons are already present in the bath, the two excitations have a drastically different dynamics: The antisoliton does not annihilate with the solitons and is therefore confined close to its origin while the soliton excitation propagates. We discuss the consequences for experiments with ultracold gases.


Original languageEnglish
Article number063605
Pages (from-to)1-12
JournalPhysical Review A
Issue number6
Publication statusPublished - 7 Jun 2017
MoE publication typeA1 Journal article-refereed

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