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arXiv 2602.09465cond-mat.mtrl-sci
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V2Se2O家族替代磁体的现实紧束缚模型

Realistic tight-binding model for V2Se2O-family altermagnets

The Hong Kong University of Science and Technology(香港科技大学);IAS Center for Quantum Matter, The Hong Kong University of Science and Technology(香港科技大学量子物质高等研究院)

Xingkai Cheng, Yifan Gao, Junjie Pengand Junwei Liu

AI总结:

本文提出了一种现实紧束缚模型,用于研究V2Se2O家族替代磁体的自旋-动量锁定和应变耦合特性,为低维自旋电子学研究提供了理论基础。

摘要:

在先前的理论预测之后,间充V2Se2O家族替代磁体,如RbV2Te2O和KV2Se2O,现已通过实验得到确认,作为d波替代磁体,代表了唯一已知的范德瓦耳斯层状替代磁体系统。通过将晶格对称性配对的自旋动量锁定(CSML)与层状结构相结合,V2Se2O家族提供了一个研究低维自旋电子响应和探索多种量子自由度相互作用的合适平台。为了建立一个具体的理论基础以理解和利用这些材料,我们研究了V2Se2O家族的六个代表性成员,并构建了一个由第一性原理计算参数化的现实紧束缚模型,该模型通过实验测量进行了验证。该模型准确捕捉了关键的替代磁性电子特性,包括CSML和非共线性自旋守恒电流。它进一步结合了应变耦合参数,使能够模拟应变可调响应,如压电霍尔效应。这种现实模型允许在单一系统内系统地探索多种自由度(如自旋、谷和层),并为理解其与其他量子材料(如拓扑绝缘体和超导体)的耦合奠定基础,从而推动对这一新型层状替代磁体类别的基本理解和潜在设备应用的发展。

英文摘要:

Following earlier theoretical prediction, intercalated V2Se2O-family altermagnets such as RbV2Te2O and KV2Se2O have now been experimentally confirmed as d-wave altermagnets, representing the only known van der Waals layered altermagnetic systems. By combining crystal-symmetry-paired spin-momentum locking (CSML) with the layered structure, the V2Se2O-family offers a suitable platform for studying low-dimensional spintronic responses and exploring the interplay among multiple quantum degrees of freedom. To establish a concrete theoretical foundation for understanding and utilizing these materials, we investigate six representative members of the V2Se2O-family and construct a realistic tight-binding model parameterized by first-principles calculations, which is benchmarked by experimental measurements. This model accurately captures essential altermagnetic electronic properties, including CSML and noncollinear spin-conserved currents. It further incorporates strain-coupling parameters, enabling the simulation of strain-tunable responses such as the piezo-Hall effects. This realistic model allows systematic exploration of multiple degrees of freedom (like spin, valley, and layer) within a single system, and lays the groundwork for understanding their coupling with other quantum materials, such as topological insulators and superconductors, thereby advancing both the fundamental understanding and potential device applications of this novel class of layered altermagnets.

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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