Interplay of nonreciprocity and nonlinearity on mean-field energy and dynamics of a Bose-Einstein condensate in a double-well potential

被引：7

作者：

Wu, Yi-Piao ^{[1
]}

Zhang, Guo-Qing ^{[1
,2
]}

Zhang, Cai-Xia ^{[1
,2
]}

Xu, Jian ^{[3
]}

Zhang, Dan-Wei ^{[1
,2
]}

机构：

[1] South China Normal Univ, Sch Phys & Telecommun Engn, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Guangzhou 510006, Peoples R China

[2] South China Normal Univ, Frontier Res Inst Phys, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Peoples R China

[3] Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Peoples R China

来源：

FRONTIERS OF PHYSICS | 2022年 / 17卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Bose-Einstein condensate; non-Hermitian physics; nonlinear dynamics; parity-time symmetry; OPTICAL ISOLATION; OSCILLATIONS; EQUATION; CIRCUIT;

D O I：

10.1007/s11467-021-1133-2

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the mean-field energy spectrum and dynamics in a Bose-Einstein condensate in a double-well potential with non-Hermiticity from the nonreciprocal hopping, and show that the interplay of nonreciprocity and nonlinearity leads to exotic properties. Under the two-mode and mean-field approximations, the nonreciprocal generalization of the nonlinear Schrodinger equation and Bloch equations of motion for this system are obtained. We analyze the PT phase diagram and the dynamical stability of fixed points. The reentrance of PT-symmetric phase and the reformation of stable fixed points with increasing the nonreciprocity parameter are found. Besides, we uncover a linear selftrapping effect induced by the nonreciprocity. In the nonlinear case, the self-trapping oscillation is enhanced by the nonreciprocity and then collapses in the PT-broken phase, and can finally be recovered in the reentrant PT-symmetric phase.

引用

页数：10

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