Ultrafast electron-phonon scattering in an antiferromagnetic Dirac semimetal

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review B Pub Date : 2025-04-21 DOI:10.1103/physrevb.111.144421

Marius Weber, Kai Leckron, Libor Šmejkal, Jairo Sinova, Baerbel Rethfeld, Hans Christian Schneider

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Abstract

Topological antiferromagnetic systems, which exhibit anisotropic band structures combined with complex relativistic spin structures in momentum space, have shown strong magnetoresistance effects driven by Dirac fermion characteristics. While these new antiferromagnets have been studied in transport experiments, very little is known about their spin-dependent electronic dynamics on ultrafast timescales and far-from-equilibrium behavior. This paper investigates theoretically the spin-dependent electronic dynamics due to electron-phonon scattering in a model electronic band structure that corresponds to a Dirac semimetal antiferromagnet. Following a spin-conserving instantaneous excitation we obtain a change of the antiferromagnetic spin polarization due to the scattering dynamics for the site-resolved spin expectation values. This allows us to identify fingerprints of the anisotropic band structure in the carrier dynamics on ultrashort timescales.

Published by the American Physical Society

2025

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反铁磁狄拉克半金属中的超快电子-声子散射

拓扑反铁磁系统表现出由狄拉克费米子特性驱动的强磁阻效应，其各向异性带结构与动量空间中的复杂相对论性自旋结构相结合。虽然这些新的反铁磁体已经在输运实验中进行了研究，但人们对它们在超快时间尺度上的自旋相关电子动力学和远离平衡态的行为知之甚少。本文从理论上研究了狄拉克半金属反铁磁体模型电子带结构中电子-声子散射引起的自旋相关电子动力学。在自旋守恒的瞬时激励下，由于位置分辨自旋期望值的散射动力学，我们得到了反铁磁自旋极化的变化。这使我们能够在超短时间尺度上识别载流子动力学中各向异性带结构的指纹。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter