The chiral anomaly, screening and low energy electron dynamics of Weyl semimetals

外尔半金属是最近发现的一类具有前所未有性质的材料。作为石墨烯的三维类似物，它们在体相中表现出具有手性准粒子的狄拉克电子，即使在室温下也具有非常大的电子迁移率。狄拉克态还在外加磁场和电场中产生强等离子体效应和其他有趣的性质。这些Adler-Bell-Jackiw或手性异常目前正在研究作为未来传感器或电子学的关键要素的应用。本建议致力于调查手征异常的钽砷使用电子拉曼散射，以实现详细了解低能量动力学和屏蔽和高流动性的相互作用。我们的数据分析是基于碰撞为主的散射，这是一个有效的方法，系统与强准粒子相互作用的制度。此外，我们遵循一个微观建模的基础上映射的光学电导率电子拉曼散射。我们以前的拓扑绝缘体的研究表明，导出的散射率同意与太赫兹吸收实验中观察到的狄拉克等离子体激元和计算的光谱形状的信号遵循我们的理论方法。我们的项目是面向一个更好的微观理解相关的散射过程和手性Weyl半金属固有的异常。

Weyl semimetals are a recently discovered class of materials with unprecedented properties. As a three-dimensional analogue to graphene they exhibit Dirac electrons in the bulk with chiral quasiparticles and an extraordinarily large electronic mobility even at room temperature. The Dirac states also give rise to strong plasmonic effects and other interesting properties in applied magnetic and electric fields. These Adler-Bell-Jackiw or chiral anomalies are presently investigated with respect to applications as key elements of future sensorics or electronics. This proposal is devoted the investigation of chiral anomalies in TaAs using electronic Raman scattering to achieve a detailed understanding of low energy dynamics and the interplay of screening and high mobility. Our data analysis is based on the regime of collision dominated scattering which is an effective approach for systems with strong quasiparticle interactions. Furthermore we follow a microscopic modelling based on a mapping of optical conductivity to electronic Raman scattering. Our previous studies of topological insulators have shown that the derived scattering rates agree well with Dirac plasmons observed in THz absorption experiments and that the calculated spectral shape of the signal follows our theoretical approach. Our project is geared towards an improved microscopic understanding of the relevant scattering processes and the chiral anomaly inherent to Weyl semimetals.