发表机构
Philipps-Universität Marburg; mar.quest—Marburg Center for Quantum Materials and Sustainable Technologies; University of Münster（马尔堡菲利普斯大学; mar.quest——马尔堡量子材料与可持续技术中心; 明斯特大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文发展微观多体理论，揭示CrSBr中激子-声子和激子-磁子相互作用的各向异性散射导致方向依赖的扩散系数，并识别出单声子与双磁子散射的温度特征，为磁性范德华半导体激子输运提供理论框架。
AI 中文摘要
二维磁性半导体为探索电荷、晶格、自旋和光之间的相互作用提供了独特平台。强库仑相互作用与长程磁有序相结合，使得激子能够与晶格振动和自旋激发有效耦合，从而强烈影响这些材料中的激子动力学和输运。在此，我们发展了单层和双层CrSBr中激子-声子和激子-磁子相互作用的微观多体理论。我们证明，CrSBr中激子的准一维特性导致了强各向异性的激子-声子和激子-磁子散射，从而产生方向依赖的扩散系数。此外，我们识别出由单声子和双磁子散射过程引起的独特温度依赖性，为潜在的微观相互作用提供了特征性标志。我们的工作为理解磁性范德华半导体中的激子输运建立了微观框架，并为未来的光学光谱学和激子输运实验提供了指导。
英文摘要
Two-dimensional magnetic semiconductors provide a unique platform for exploring the interplay between charge, lattice, spin, and light. The strong Coulomb interaction combined with long-range magnetic order enables efficient coupling between excitons and both lattice vibrations and spin excitations, thereby strongly influencing exciton dynamics and transport in these materials. Here, we develop a microscopic many-body theory of exciton--phonon and exciton--magnon interactions in mono- and bilayer CrSBr. We demonstrate that the quasi-one-dimensional character of excitons in CrSBr gives rise to strongly anisotropic exciton--phonon and exciton--magnon scattering, resulting in direction-dependent diffusion coefficients. Furthermore, we identify a distinct temperature dependence originating from one-phonon and two-magnon scattering processes, providing characteristic signatures of the underlying microscopic interactions. Our work establishes a microscopic framework for understanding exciton transport in magnetic van der Waals semiconductors and provides guidance for future optical spectroscopy and exciton transport experiments.
Comments21 pages, 6 figures
