发表机构
Nanjing University of Science and Technology; Beihang University; RIKEN Center for Emergent Matter Science (CEMS); Beijing Normal University; University of California, Davis（南京理工大学; 北京航空航天大学; 理化学研究所凝聚物质科学中心; 北京师范大学; 加州大学戴维斯分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过量子蒙特卡洛模拟和线性自旋波理论，揭示了三角晶格硬核玻色子超固体的独特动力学谱特征，为量子磁体中的超固体研究提供了关键依据。
AI 中文摘要
我们通过大规模量子蒙特卡洛模拟和线性自旋波理论，研究了三角晶格硬核玻色子-哈伯德模型中超固体相的动力学特征。我们揭示了谱权重中明显的动量空间分离。横谱在$\Gamma$和$K$点显示出无能隙的戈德斯通模式，而纵谱在$K$点具有无能隙模式，并在$M$点出现类似旋子的极小值。直接在虚时域中，超固体通过$\Gamma$和$K$点横谱线的共存而被明确表征。此外，我们表明强量子涨落导致尖锐准粒子图像的破坏，产生不对称的线形和宽的连续谱。我们的工作确立了硬核玻色子超固体的明确动力学特征，为三角量子磁体中类似的旋量超固体提供了关键见解。
英文摘要
We investigate the dynamical signatures of the supersolid phase in the triangular-lattice hardcore Bose-Hubbard model via large-scale quantum Monte Carlo simulations and linear spin-wave theory. We reveal a distinct momentum-space separation in the spectral weights. The transverse spectrum shows gapless Goldstone modes at the $Γ$ and $K$ points, while the longitudinal spectrum features a gapless mode at $K$ and a roton-like minimum at $M$. Directly in the imaginary-time domain, the supersolid is unambiguously characterized by the coexistence of transverse spectral lines at $Γ$ and $K$. Furthermore, we show that strong quantum fluctuations induce a breakdown of the sharp quasiparticle picture, leading to asymmetric line shapes and broad continua. Our work establishes the definitive dynamical signatures of the hardcore-boson supersolid, providing key insights into analogous spin supersolids in triangular quantum magnets.
Comments6 pages, 4 figures
