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arXiv:2608.08738

Ground-state phase diagram and route to supersolidity in a two-component extended Bose-Hubbard model

Xuexin Qiu, Ning Bian, Yang Liu, Saisai He, Z. Y. Xie, Hong-Gang Luo, Jize Zhao

Published Aug 9, 2026• 0 citations
arXivHTMLPDF

Abstract

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.

DOI
10.48550/arxiv.2608.08738

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