Non-Hermitian superfluid--Mott-insulator transition in the one-dimensional zigzag bosonic chains

We investigated the behavior of non-Hermitian bosonic gases with Hubbard interactions in the one-dimensional zigzag optical lattices through the calculation of dynamic response functions. Our findings showed the existence of a non-Hermitian quantum phase transition that is dependent on the pseudo-He...

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Bibliographic Details
Published in:arXiv.org 2023-09
Main Authors: Li, Chengxi, Wu, Yubiao, Wu-Ming, Liu
Format: Article
Language:English
Subjects:
Dissipation
Dynamic response
Fluids
Liquid phases
Optical lattices
Phase transitions
Response functions
Superfluidity
Symmetry
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Summary:We investigated the behavior of non-Hermitian bosonic gases with Hubbard interactions in the one-dimensional zigzag optical lattices through the calculation of dynamic response functions. Our findings showed the existence of a non-Hermitian quantum phase transition that is dependent on the pseudo-Hermitian symmetry. The system tends to exhibit a superfluid phase, when subjected to weak dissipation. While under strong dissipation, the pseudo-Hermitian symmetry of the system is partially broken, leading to a transition towards a normal liquid phase. As the dissipation increases beyond the critical threshold, the pseudo-Hermitian symmetry is completely broken, resulting in a Mott-insulator phase. We propose an experimental setup using one-dimensional zigzag optical lattices containing two-electron atoms to realize this system. Our research emphasizes the key role of non-Hermiticity in quantum phase transitions and offers a new theoretical framework as well as experimental methods for understanding the behavior of dissipative quantum systems, implicating significant development of new quantum devices and technologies.
ISSN:2331-8422