Impurity and soliton dynamics in a Fermi gas with nearest-neighbor interactions
arXiv:1701.01845 · doi:10.1103/PhysRevA.95.063605
Abstract
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 pertubations 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.
12 pages, 16 figures
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