Tracking Ultrafast Photocurrents in the Weyl Semimetal TaAs Using THz Emission Spectroscopy
| Autor: | Nicholas Sirica, Ni Ni, Bing Xu, Stuart A. Trugman, Run Yang, Pamela Bowlan, X. G. Qiu, Rohit P. Prasankumar, Jian-Xin Zhu, Bing Shen, Abul Kalam Azad, G. F. Chen, Antoinette J. Taylor, L. X. Zhao, Dmitry Yarotski, Ra'anan Tobey, Yaomin Dai |
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| Rok vydání: | 2019 |
| Předmět: |
Photocurrent
Physics Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Condensed Matter::Other Terahertz radiation FOS: Physical sciences Physics::Optics General Physics and Astronomy Weyl semimetal Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Polarization (waves) Ray Semimetal Condensed Matter - Strongly Correlated Electrons Excited state Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Emission spectrum |
| Zdroj: | Physical Review Letters. 122 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We investigate polarization-dependent ultrafast photocurrents in the Weyl semimetal TaAs using terahertz (THz) emission spectroscopy. Our results reveal that highly directional, transient photocurrents are generated along the non-centrosymmetric c-axis regardless of incident light polarization, while helicity-dependent photocurrents are excited within the ab-plane. This is consistent with earlier static photocurrent experiments, and demonstrates on the basis of both the physical constraints imposed by symmetry and the temporal dynamics intrinsic to current generation and decay that optically induced photocurrents in TaAs are inherent to the underlying crystal symmetry of the transition metal monopnictide family of Weyl semimetals. |
| Databáze: | OpenAIRE |
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