Laboratoire de Physique Théorique
Toulouse - UMR 5152

Interacting quantum particles obey a set of relations known as the Tan relations, provided that the interactions are short-ranged [1-4]. Using these relations - in particular the algebraic decay of the momentum distribution - I will show how a sudden switching-off of the interactions (a negative interaction quench) leads to a delocalization mechanism under fairly mild conditions [5]. If time permits I will also briefly discuss a recent numerical (DMRG) study of the collision dynamics of an impurity in a one-dimensional bosonic system [6].

[1] E. Braaten, in "The BCS-BEC Crossover and the Unitary Fermi Gas", ed. W. Zwerger (2012), arXiv:1008.2922
[2] E. V. H. Doggen and J. J. Kinnunen, Phys. Rev. Lett. 111, 025302 (2013)
[3] E. V. H. Doggen, A. Korolyuk, P. Törmä and J. J. Kinnunen, Phys Rev. A 89, 053621 (2014)
[4] E. V. H. Doggen and J. J. Kinnunen, Sci. Rep. 5, 9539 (2015)
[5] E. V. H. Doggen and J. J. Kinnunen, New J. Phys 16, 113051 (2014)
[6] E. V. H. Doggen, S. Peotta, P. Törmä and J. J. Kinnunen, Phys. Rev. A 92, 032705 (2015)