arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.03458cond-mat.str-elcond-mat.mes-hallquant-ph
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三角格子哈伯德模型中手征自旋液体的空穴谱函数

Hole Spectral Function of a Chiral Spin Liquid in the Triangular Lattice Hubbard Model

Wilhelm Kadow, Laurens Vanderstraeten, Michael Knap

摘要:

量子自旋液体是一种迷人的物质相态,具有分数自旋激发和非常规的长程量子纠缠。然而,这些奇特的性质也使它们的实验表征具有挑战性,因此找到诊断量子自旋液体的方法是一个相关的挑战。在这里,我们数值计算的光谱函数的一个单一的空穴掺杂到半填充哈伯德模型上的三角形晶格使用技术的基础上的矩阵产品的状态。在半填充的系统已被提出,以实现在中等相互作用强度的手征自旋液体,周围的磁有序相在强相互作用和超导/金属相在弱相互作用。我们发现,这些阶段的光谱表现出不同的签名。通过开发适当的部分子平均场的描述,我们获得洞察到相关的低能量功能。虽然磁相的特点是通过有序的自旋背景移动的修饰孔,我们发现旋子动力学的手征自旋液体的迹象。我们的研究结果表明,空穴光谱函数,测量角分辨光电子能谱,提供了一个有用的工具来表征量子自旋液体。

英文摘要:

Quantum spin liquids are fascinating phases of matter, hosting fractionalized spin excitations and unconventional long-range quantum entanglement. These exotic properties, however, also render their experimental characterization challenging, and finding ways to diagnose quantum spin liquids is therefore a pertinent challenge. Here, we numerically compute the spectral function of a single hole doped into the half-filled Hubbard model on the triangular lattice using techniques based on matrix product states. At half-filling the system has been proposed to realize a chiral spin liquid at intermediate interaction strength, surrounded by a magnetically ordered phase at strong interactions and a superconducting/metallic phase at weak interactions. We find that the spectra of these phases exhibit distinct signatures. By developing appropriate parton mean-field descriptions, we gain insight into the relevant low-energy features. While the magnetic phase is characterized by a dressed hole moving through the ordered spin background, we find indications of spinon dynamics in the chiral spin liquid. Our results suggest that the hole spectral function, as measured by angle-resolved photoemission spectroscopy, provides a useful tool to characterize quantum spin liquids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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