Photon-assisted PT symmetry and stability of two strongly interacting bosons in a non-Hermitian driven double well
Abstract
We investigate how the driving field and strong interatomic interaction affect the parity-time (PT) symmetry and stability of two interacting bosons in a non-Hermitian double-well system by means of a multiple-time-scale asymptotic analysis. In contrast to the usually PT-symmetric case without the driving, for which the interatomic interaction always break the PT symmetry, we show that photon resonance can assist PT symmetry when a nearly-resonant condition between the interaction strength and the driving parameter is established. In the non- PT-symmetric regime, the stability of the two strongly interacting bosons can also be restored under a balance condition that can be obtained by adjusting the driving parameter. Our results may provide a promising way for manipulating non-Hermitian strongly correlated many-body systems by utilizing periodic driving fields.
- Publication:
-
Physics Letters A
- Pub Date:
- March 2020
- DOI:
- 10.1016/j.physleta.2019.126197
- Bibcode:
- 2020PhLA..38426197Z
- Keywords:
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- Parity-time symmetry;
- Two-body interaction;
- Periodic driving