[论文解读] Raman Spectroscopic Investigation of Kitaev Quantum Spin Liquids

Vivek Kumar, Pradeep Kumar|arXiv (Cornell University)|Feb 10, 2026

Advanced Condensed Matter Physics被引用 0

一句话总结

一篇讨论拉曼光谱作为Kitaev量子自旋液体探针的综述，概述真实材料与扰动如何影响Kitaev物理，以及拉曼信号揭示量子自旋液体行为的潜力。

ABSTRACT

Quantum spin liquids, a highly topologically entangled, dynamically correlated state where quantum fluctuations preclude any long-range ordering down to absolute zero. In the search for a topologically robust qubit, the scientific community has been in continuous hunt for real quantum spin liquid systems. Alexei Kitaev in his exactly solvable model for a spin-1/2 two-dimensional honeycomb lattice, presented a system that hosts a topologically protected state (Majorana zero-modes). Under an applied external field, the Kitaev spin liquids turn into a topologically non-trivial chiral spin-liquid state with non-abelian anionic excitations, which is crucial for quantum computing. Earlier theoretical predictions advocated that Kitaev physics can be realized in spin-orbit-coupled Mott insulators such as honeycomb irradiates and ruthenates. However, the experimental findings continuously challenge the theoretical aspects, indicating the presence of non-Kitaev interactions in real materials, where the dimensionality, disorder (vacancy), chemical composition, generalized spin-S, and external perturbations (pressure, magnetic field, temperature) can actively tune the Kitaev interactions and the ground state excitations. In this review article, a comprehensive discussion is included with an updated literature survey in the context of the potential of Raman spectroscopy as a probe for Kitaev quantum spin liquids.

研究动机与目标

• Motivate the search for real quantum spin liquid systems with Kitaev physics and topological properties.
• Summarize how Raman spectroscopy can probe Kitaev quantum spin liquids and their excitations.
• Assess how material imperfections and external perturbations influence Kitaev interactions and experimental signatures.

提出的方法

• Review theoretical predictions of Kitaev physics in spin-orbit–coupled Mott insulators.
• Assess Raman spectroscopy techniques and their relevance to detecting Kitaev-related excitations.
• Discuss how dimensionality, disorder, composition, spin value, pressure, magnetic field, and temperature affect Kitaev physics as observed by Raman probes.

实验结果

研究问题

• RQ1 What are the Raman-active signatures indicative of Kitaev quantum spin liquids?
• RQ2 How do non-Kitaev interactions and real-material perturbations modify Raman responses and Kitaev physics?
• RQ3 Under which conditions can Raman spectroscopy reliably reveal Kitaev excitations and potential Majorana modes?

主要发现

• Raman spectroscopy is highlighted as a comprehensive probe for Kitaev quantum spin liquids.
• Non-Kitaev interactions and material imperfections can significantly alter Kitaev physics in real systems.
• External perturbations such as pressure and magnetic field can tune Kitaev interactions and ground-state excitations.
• The review consolidates updated literature on Raman probes and their potential to identify Kitaev-related states in spin-orbit–driven Mott insulators.