Journal
PHYSICAL REVIEW B
Volume 95, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.235108
Keywords
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Funding
- National Key Research and Development Program of China [2016YFA0300300, 2016YFA0401000]
- National Basic Research Program of China [2015CB921301]
- National Natural Science Foundation of China [11574383, 11274372, 11274362, 11474330, 11674371]
- CAS Interdisciplinary Innovation Team
- External Cooperation Program of Chinese Academy of Sciences [GJHZ1403]
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We report an ultrafast lattice dynamics investigation of the topological Dirac semimetal Cd3As2. A coherent phonon beating among three evenly spaced A(1g) optical phonon modes (of frequencies 1.80, 1.96, and 2.11 THz, respectively) is unambiguously observed. The two side modes originate from the counter helixes composing Cd vacancies. Significantly, such helix vacancy- induced phonon (HVP) modes experience prominent extra waning in their ultrafast dynamics as temperature increases, which is immune to the central mode. Above 200 K, the HVP becomes inactive, which may potentially affect the topological properties. Our results in the lattice degree of freedom suggest the indispensable role of temperature in considering topological properties of such quantum materials.
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