Phonon instability of insulating states in optical lattices

24th International Laser Physics Workshop

Yukalov, V.I.^1 ; Ziegler, K.^2

Bogolubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna

141980, Russia^1

Institut für Physik, Universität Augsburg, Augsburg

D-86135, Germany^2

关键词: Atomic interactions;    Delocalization effects;    Insulating state;    Long ranges;    Phonon excitations;    Phonon instabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/691/1/012014/pdf
DOI  :  10.1088/1742-6596/691/1/012014

来源: IOP

【 摘 要 】

The influence of collective phonon excitations, due to intersite atomic interactions, on the stability of optical lattices is analyzed. These phonon excitations are shown to essentially reduce the ability of atoms to be localized. The states that seem to be insulating in the absence of the phonon excitations can become delocalized when the latter are present. The delocalization effect exists for both long-range as well as local atomic interactions.