Non-Hermitian ultra-strong bosonic clustering through interaction-induced caging

TL;DR

This paper introduces a novel mechanism combining non-Hermitian pumping, bosonic interactions, and topology to achieve ultra-strong bosonic condensation through an emergent caging effect, applicable to many-boson systems.

Contribution

It reveals a new interaction-induced caging mechanism that enhances bosonic condensation in non-Hermitian topological systems, extending beyond minimal models.

Findings

Demonstrates ultra-strong bosonic condensation due to caging

Shows the mechanism applies to many-boson systems with broad interactions

Highlights potential for controlling bosons via non-Hermitian topology

Abstract

We uncover a new mechanism whereby the triple interplay of non-Hermitian pumping, bosonic interactions and nontrivial band topology leads to ultra-strong bosonic condensation. The extent of condensation goes beyond what is naively expected from the interaction-induced trapping of non-Hermitian pumped states, and is based on an emergent caging mechanism that can be further enhanced by topological boundary modes. Beyond our minimal model with 2 bosons, this caging remains applicable for generic many-boson systems subject to a broad range of density interactions and non-Hermitian hopping asymmetry. Our novel new mechanism for particle localization and condensation would inspire fundamental shifts in our comprehension of many-body non-Hermitian dynamics and opens new avenues for controlling and manipulating bosons.