掺杂反铁磁体中隐藏序赝隙相的有效理论
Effective theory of the hidden-order pseudogap phase in a doped antiferromagnet
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中文总结 AI 辅助
本文为掺杂反铁磁体建立基于涨落条纹的有效模型,通过蒙特卡洛模拟揭示隐藏Néel序的赝隙相,识别出高温BKT型退禁闭交叉(对应$T^*$)和低温条纹不稳定性,并可在超冷费米子模拟器中验证。
中文摘要 AI 辅助
赝隙相的微观起源是与铜氧化物材料中高温超导的出现相关的一个长期未解之谜。在本工作中,我们针对掺杂反铁磁体建立了一个有效模型,该模型以涨落条纹(即弦状畴壁)来描述,这些条纹掩盖了自旋背景的反铁磁序。在由此产生的晶格规范理论中,Néel序的这些畴壁的开放端被视为涡旋。我们通过经典蒙特卡洛模拟数值评估了相图,使用基于逾渗的几何序参量来诊断隐藏的Néel序。在高温下,我们识别出一个BKT型交叉,其中畴壁端变得退禁闭。我们将此解释为从隐藏序区到上方顺磁金属的$T^*$交叉。在低温下,我们识别出条纹不稳定性。我们有效模型的预测可以在超冷费米子量子模拟器中得到检验。
英文摘要
The microscopic origin of the pseudogap phase constitutes a longstanding puzzle related to the emergence of high-temperature superconductivity in cuprate materials. In this work, we develop an effective model for doped antiferromagnets in terms of fluctuating stripes, or string-like domain walls, which obscure the antiferromagnetic order of the spin background. The open ends of such domain walls of the N'eel order are treated as vortices in the resulting lattice gauge theory. We numerically evaluate the phase diagram by classical Monte Carlo simulations, using percolation-based geometric order parameters to diagnose hidden N'eel order. At high temperatures, we identify a BKT-type crossover in which the domain wall ends become deconfined. We interpret this as the $T^*$ crossover from the hidden order regime to the paramagnetic metal above. At low temperatures, we identify stripe instabilities. Predictions of our effective model can be tested in ultracold fermion quantum simulators.
发表机构
- Ludwig-Maximilians-Universität Munich(慕尼黑大学)
- Munich Center for Quantum Science and Technology (MCQST)(慕尼黑量子科学与技术中心)
- Max Planck Institute of Quantum Optics(马克斯·普朗克量子光学研究所)
- Technical University of Munich(慕尼黑工业大学)
- Harvard University(哈佛大学)
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