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

Törmä, P.
Published in Physical Review. A. 2017, vol. 95, no. 6, p. 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 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.
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Research group Groupe Giamarchi
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VISURI, Anne-Maria, TÖRMÄ, P., GIAMARCHI, Thierry. Impurity and soliton dynamics in a Fermi gas with nearest-neighbor interactions. In: Physical Review. A, 2017, vol. 95, n° 6, p. 063605. doi: 10.1103/PhysRevA.95.063605 https://archive-ouverte.unige.ch/unige:101045

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Deposited on : 2018-01-02

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