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

外尔半金属的手性异常、筛选和低能电子动力学

• 批准号: 346795687
• 负责人: Professor Dr. Peter Lemmens
• 金额: --
• 依托单位: Institut für Physik der Kondensierten Materie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/346795687?language=en
• 关键词: chiral; anomaly; screening; low; energy

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.

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。狄拉克态在外加磁场和电场中也会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。我们之前对拓扑绝缘体的研究表明，推导出的散射率与太赫兹吸收实验中观察到的狄拉克等离子体激元非常一致，并且计算出的信号光谱形状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。

项目成果

Non-Abelian statistics in light-scattering processes across interacting Haldane chains

相互作用的霍尔丹链光散射过程中的非阿贝尔统计

• DOI: 10.1103/physrevb.104.165118
• 发表时间: 2021
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: V. Gnezdilov;V. Kurnosov;Yu. G. Pashkevich;A. K. Bera;A. T. M. N. Islam;B. Lake;B. Lobbenmeier;D. Wulferding;P. Lemmens
• 通讯作者: P. Lemmens

Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)2

• DOI: 10.1038/s41535-021-00405-7
• 发表时间: 2021-11
• 期刊: npj Quantum Materials
• 影响因子: 5.7
• 作者: D. Wulferding;Youngsu Choi;Seungyeol Lee;M. Prosnikov;Y. Gallais;P. Lemmens;Cheng-Cheng Zhong-Cheng;H. Kageyama;Kwang-Yong Choi

Raman scattering of plane-wave and twisted light off chiral molecular liquids

手性分子液体的平面波和扭曲光的拉曼散射

• DOI: 10.1063/10.0006577
• 发表时间: 2021
• 期刊: Low Temperature Physics
• 影响因子: 0.8
• 作者: F. Büscher;S. Müllner;D. Wulferding;Yu. G. Pashkevich;V. Gnezdilov;A. A. Peshkov;A. Surzhykov;P. Lemmens
• 通讯作者: P. Lemmens

Kitaev Spin Liquid Candidate OsxCl3 Comprised of Honeycomb Nano-Domains

• DOI: 10.7566/jpsj.89.114709
• 发表时间: 2020-10
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: Kataoka Kota;Hirai Daigoro;Yajima Takeshi;Nishioka Daisuke;Ishii Rieko;Choi Kwang-Yong;Wulferding Dirk;Lemmens Peter;Kittaka Shunichiro;Sakakibara Toshiro;Ishikawa Hajime;Matsuo Akira;Kindo Koichi;Hiroi Zenji