基于纳米石墨烯的反铁磁自旋1/2海森堡链的自旋激发

IF 37.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Chenxiao Zhao, Lin Yang, João C. G. Henriques, Mar Ferri-Cortés, Gonçalo Catarina, Carlo A. Pignedoli, Ji Ma, Xinliang Feng, Pascal Ruffieux, Joaquín Fernández-Rossier, Roman Fasel
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引用次数: 0

摘要

反铁磁海森堡链表现出两种不同类型的激发谱:整数自旋链的间隙和半整数自旋链的无间隙。然而,在有限长度的半整数自旋链中,量化引起了一个间隙,需要对足够长的链进行精确控制以研究其演变。在这里,我们通过共价连接奥林匹克-奥林匹克环形磁性纳米石墨烯,创建了长度控制自旋1/2的海森堡链。该系统具有大的交换相互作用,可调的长度和可忽略不计的磁各向异性,是研究长度相关自旋激发的理想选择,通过非弹性电子隧穿光谱探测。我们观察到长度为L的最低激发能呈幂律衰减,在大L区呈1/L依赖性,与理论一致。当L = 50时,v形激励连续体证实了热力学极限下的无间隙行为。此外,低偏置电流图揭示了奇数链中单个自旋子的驻波。我们的发现为在人工石墨烯晶格内实现一维模拟无间隙自旋液体提供了证据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spin excitations in nanographene-based antiferromagnetic spin-1/2 Heisenberg chains

Spin excitations in nanographene-based antiferromagnetic spin-1/2 Heisenberg chains

Antiferromagnetic Heisenberg chains exhibit two distinct types of excitation spectrum: gapped for integer-spin chains and gapless for half-integer-spin chains. However, in finite-length half-integer-spin chains, quantization induces a gap, requiring precise control over sufficiently long chains to study its evolution. Here we create length-controlled spin-1/2 Heisenberg chains by covalently linking Olympicenes—Olympic-ring-shaped magnetic nanographenes. With large exchange interactions, tunable lengths and negligible magnetic anisotropy, this system is ideal for investigating length-dependent spin excitations, probed via inelastic electron tunnelling spectroscopy. We observe a power-law decay of the lowest excitation energy with length L, following a 1/L dependence in the large-L regime, consistent with theory. For L = 50, a V-shaped excitation continuum confirms a gapless behaviour in the thermodynamic limit. Additionally, low-bias current maps reveal the standing wave of a single spinon in odd-numbered chains. Our findings provide evidence for the realization of a one-dimensional analogue of a gapless spin liquid within an artificial graphene lattice.

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来源期刊
Nature Materials
Nature Materials 工程技术-材料科学:综合
CiteScore
62.20
自引率
0.70%
发文量
221
审稿时长
3.2 months
期刊介绍: Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
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