Low-Energy Optical Conductivity of TaP: Comparison of Theory and Experiment

Crystals

ArtemV. Pronin¹  Alexander Yaresko² 

[1] 1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany;Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany;

关键词: Weyl semimetals;    band-structure calculations;    optical response;   

DOI  :  10.3390/cryst11050567

来源: DOAJ

【 摘 要 】

The ab-plane optical conductivity of the Weyl semimetal TaP is calculated from the band structure and compared to the experimental data. The overall agreement between theory and experiment is found to be best when the Fermi level is slightly (20 to 60 meV) shifted upwards in the calculations. This confirms a small unintentional doping of TaP, reported earlier, and allows a natural explanation of the strong low-energy (50 meV) peak seen in the experimental ab-plane optical conductivity: this peak originates from transitions between the almost parallel non-degenerate electronic bands split by spin-orbit coupling. The temperature evolution of the peak can be reasonably well reproduce by calculations using an analog of the Mott formula.

【 授权许可】

Unknown