July 17 2014

New article: Phys. Rev. A 90, 013617

Quenching small quantum gases: Genesis of the orthogonality catastrophe

Steve Campbell, Miguel Ángel García-March, Thomás Fogarty, and Thomas Busch
Phys. Rev. A 90, 013617

We study the dynamics of two strongly interacting bosons with an additional impurity atom trapped in a harmonic potential. Using exact numerical diagonalization we are able to fully explore the dynamical evolution when the interaction between the two distinct species is suddenly switched on (quenched). We examine the behavior of the densities, the entanglement, the Loschmidt echo, and the spectral function for a large range of interspecies interactions and find that even in such small systems evidence of Anderson's orthogonality catastrophe can be witnessed.

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