AI 中文总结
本文采用投影纠缠对态方法研究双组分扩展玻色-哈伯德模型的基态相图，识别四种相，发现无超固体相，通过调控参数识别出轨道选择性超固体相，为偶极激子平台实现超固体提供路径。
AI 中文摘要
我们采用投影纠缠对态（PEPS）方法，研究了近期利用偶极激子实现的双组分扩展玻色-哈伯德模型的基态相图。针对实验相关的参数范围，我们识别出棋盘相、莫特绝缘相、超流相和真空相。这些相表现出轨道选择性特征，即两组分占据不同量子态，但未发现超固体相存在的证据。超固体相的缺失归因于强相互作用主导的微观能量尺度，其严重限制了超流相的范围。基于超固体机制的指导，我们进一步探索了邻近参数范围，其中一组分的隧穿作用增强，并识别出轨道选择性超固体相。进一步的有限键维度和原胞分析证实了该相的鲁棒性。我们的结果阐明了偶极激子平台的零温度相结构，并为在该体系中实现超固体提供了可行路径。
英文摘要
We investigate the ground-state phase diagram of a two-component extended Bose-Hubbard model recently realized with dipolar excitons, using the projected entangled-pair states. For the experimentally relevant parameter regime, checkerboard, Mott-insulating, superfluid, and vacuum phases are identified. These phases exhibit orbital-selective character, wherein the two components occupy different quantum states, but we find no evidence for a supersolid phase. The absence of supersolidity is attributed to the strongly interaction-dominated microscopic energy scales, which severely restrict the superfluid regime. Guided by the supersolid mechanism, we further explore a nearby parameter regime with enhanced hopping of one component and identify an orbital-selective supersolid phase. Further finite bond-dimension and unit-cell analyses establish the robustness of this phase. Our results clarify the zero-temperature phase structure of the dipolar-exciton platform and provide a possible route toward realizing supersolidity in this setting.
