Coherent helix vacancy phonon and its ultrafast dynamics waning in topological Dirac semimetal Cd<sub>3</sub>As<sub>2</sub>

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APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session S10: New Phenomena In Dirac and Other Topological Semimetals

11:15 AM–2:15 PM, Thursday, March 8, 2018
LACC Room: 301B

Sponsoring Unit: DMP
Chair: Zhijun Wang, Princeton University

Abstract ID: BAPS.2018.MAR.S10.5

Abstract: S10.00005 : Coherent helix vacancy phonon and its ultrafast dynamics waning in topological Dirac semimetal Cd₃As₂*

12:27 PM–12:39 PM

Abstract

Presenter:

Fei Sun
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Authors:

Fei Sun
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Qiong Wu
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Yanling Wu
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Hui Zhao
(Insititute of Physics, Chinese Academy of Scienes (CAS))

changjiang yi
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Yichao Tian
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Hongwen Liu
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Youguo Shi
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Hong Ding
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Xi Dai
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Pierre Richard
(Insititute of Physics, Chinese Academy of Scienes (CAS))

Jimin Zhao
(Insititute of Physics, Chinese Academy of Scienes (CAS))

We report an ultrafast lattice dynamics investigation of the topological Dirac semimetal Cd₃As₂. A coherent phonon beating among three evenly spaced A₁_g 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.

*This work was supported by the National Key Research and Development Program of China (Grants No.2016YFA0300300 and No. 2016YFA0401000), the National Basic Research Program of China (Grant No.2015CB921301), the National Natural Science Foundation of China (Grants No. 11574383, No. 11274372, No. 11274362,

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.S10.5

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Bulletin of the American Physical Society

APS March Meeting 2018

Volume 63, Number 1

Monday–Friday, March 5–9, 2018; Los Angeles, California

Session S10: New Phenomena In Dirac and Other Topological Semimetals

Abstract: S10.00005 : Coherent helix vacancy phonon and its ultrafast dynamics waning in topological Dirac semimetal Cd3As2*

Presenter:

Authors:

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Abstract: S10.00005 : Coherent helix vacancy phonon and its ultrafast dynamics waning in topological Dirac semimetal Cd₃As₂*