狄拉克半金属Cd3As2中的非线性太赫兹声子

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

Physical Review B Pub Date : 2025-07-14 DOI:10.1103/y2bx-tkkq

Ahmed Ghalgaoui, Fan Yang, Patrick Pilch, Taehee Kang, Matthias Runge, Shengying Yue, Yubi Chen, Yunkun Yang, Faxian Xiu, Xian-Lei Sheng, Shengyuan A. Yang, Zhe Wang

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引用次数: 0

摘要

利用相干二维太赫兹（THz）光谱研究了三维（3D）狄拉克半金属Cd3As2在光-物质相互作用的非摄动状态下的相干晶格动力学，作为时间延迟和场强的函数。相位分辨非线性信号在1.48 THz处显示出相干声子模式，对应于B2g拉曼有源模式，其特征是子结构中两个镉原子向两个镉空位方向和远离两个空位的周期性运动。强太赫兹电场与三维狄拉克半金属Cd3As2的相互作用通过隧道电离导致瞬态载流子不平衡，从而导致位移力驱动非相互作用拉曼主动模式的晶格动力学。对声子模式的选择性激发可以在原子水平上精确控制材料的特性，从而开辟了操纵其拓扑特性的新途径。2025年由美国物理学会出版

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Nonlinear terahertz phononics in the Dirac semimetal Cd3As2

The coherent lattice dynamics in the three-dimensional (3D) Dirac semimetal Cd3As2 is investigated in the nonperturbative regime of light-matter interaction using coherent two-dimensional terahertz (THz) spectroscopy, as a function of time delay and field strength. The phase-resolved nonlinear signal reveals a coherent phonon mode at 1.48 THz, corresponding to the B2g Raman-active mode, characterized by the periodic motion of two cadmium atoms in the substructure toward and away from two cadmium-vacant sites. The interaction of a strong THz electric field with the 3D Dirac semimetal Cd3As2 leads to transient charge carrier imbalance via tunneling ionization, which results in a displacive force that drives the lattice dynamics of a noninteracting Raman-active mode. The selective excitation of otherwise inaccessible phonon modes enables precise control over the material's properties at the atomic level, opening new pathways to manipulate its topological characteristics.

Published by the American Physical Society

2025

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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