期刊
OPTICS EXPRESS
卷 28, 期 11, 页码 15855-15862出版社
Optica Publishing Group
DOI: 10.1364/OE.383995
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资金
- National Key Research and Development Program of China [2017YFA0303603, 2016YFA0300300]
- National Natural Science Foundation of China [11774408, 11574383]
- Beijing Natural Science Foundation [4191003]
- External Cooperation Program, Chinese Academy of Sciences [GJHZ1826]
- Chinese Academy of Sciences Interdisciplinary Innovation Team
We use an ultrafast optical pump-probe spectroscopy to study quasiparticle (QP) dynamics in a topological insulator LaBi. Temperature-dependent optical measurements have been carried out, by which we observed nearly constant fast component (with a lifetime of 0.15 ps) and slow component (with a lifetime of 1.5 ps) for the whole range from 10 K to 295 K. The laser fluence dependence result shows that there is no saturation for the QP dynamics up to 3.3 mJ /cm(2). Moreover, an E-g mode transverse optical (TO) coherent phonon has also been observed, with a frequency of 2.8 THz. Our results provide for the first time the ultrafast dynamics information of both the QPs and coherent phonons in a nodal line topological material. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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