发表机构
Department of Physics, Kyoto University（京都大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在玻色子Kitaev链中探索非平衡玻色-爱因斯坦凝聚，发现配对强度超阈值时形成超流体序，并通过赝自旋映射揭示非厄米狄拉克激发及边界束缚态与临界简并等特征。
AI 中文摘要
我们研究了玻色子Kitaev链中的非平衡玻色-爱因斯坦凝聚体（BEC）。在平均场框架内，我们表明当配对强度超过临界阈值时，玻色子超流体序得以发展。凝聚体序参量在偶数与奇数格点之间采用交替相位，从而产生自发的子晶格有序性。通过将涌现的子晶格自由度映射到赝自旋上，基本Bogoliubov激发由非厄米狄拉克哈密顿量描述，展现出两个显著特征：边界处局域的重入玻色子Andreev束缚态，以及临界点处异常Majorana玻色子的宏观简并性。
英文摘要
We explore a nonequilibrium Bose-Einstein condensate (BEC) in a bosonic Kitaev chain. Within a mean-field framework, we show that bosonic superfluid order develops once the pairing strength exceeds a critical threshold. The condensate order parameter adopts an alternating phase between even and odd sites, giving rise to a spontaneous sublattice ordering. By mapping the emergent sublattice degrees of freedom onto a pseudospin, the elementary Bogoliubov excitation is described by a non-Hermitian Dirac Hamiltonian, displaying two prominent features: a re-entrant bosonic Andreev bound state localized around boundaries, and a macroscopic degeneracy of exceptional Majorana bosons at the critical point.
Comments7 pages, 4 figures
