arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1305.2196cond-mat.mes-hallcond-mat.str-el
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短窄石墨烯扶手椅型纳米带的磁关联

Magnetic Correlations in Short and Narrow Graphene Armchair Nanoribbons

Michael Golor, Cornelie Koop, Thomas C. Lang, Stefan Wessel, Manuel J. Schmidt

摘要:

窄扶手椅纳米带末端的电子态会产生一对非局部纠缠的自旋。我们提出了两个实验来探测这些磁状态,基于磁力学和隧道光谱学,其中相关效应导致对外部磁场的显著的非线性响应。基于我们在这里推导的低能理论,评估磁边缘态的这些非线性特征非常简单。有效的理论特别适用于参数制度,其他方法,如量子蒙特卡罗模拟是非常困难的,由于指数小的能量尺度。这里讨论的扶手椅带状设置提供了一个有希望的良好控制(实验和理论)的环境,用于研究石墨烯基纳米结构中边缘磁性背后的原理。

英文摘要:

Electronic states at the ends of a narrow armchair nanoribbon give rise to a pair of non-locally entangled spins. We propose two experiments to probe these magnetic states, based on magnetometry and tunneling spectroscopy, in which correlation effects lead to a striking, nonlinear response to external magnetic fields. On the basis of low-energy theories that we derive here, it is remarkably simple to assess these nonlinear signatures for magnetic edge states. The effective theories are especially suitable in parameter regimes where other methods such as quantum Monte-Carlo simulations are exceedingly difficult due to exponentially small energy scales. The armchair ribbon setup discussed here provides a promisingly well-controlled (both experimentally and theoretically) environment for studying the principles behind edge magnetism in graphene-based nano-structures.

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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