High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics
The Dirac semimetal cadmium arsenide (Cd3As2), a 3D electronic analog of graphene, has sparked renewed research interests for its novel topological phases and excellent optoelectronic properties. The gapless nature of its 3D electronic band facilitates strong optical nonlinearity and supports Dirac...
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sg-ntu-dr.10356-1596982022-06-29T08:09:56Z High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics Dai, Zijie Manjappa, Manukumara Yang, Yunkun Tan, Thomas CaiWei Qiang, Bo Han, Song Wong, Liang Jie Xiu, Faxian Liu, Weiwei Singh, Ranjan School of Physical and Mathematical Sciences School of Electrical and Electronic Engineering The Photonics Institute Centre for Disruptive Photonic Technologies (CDPT) Science::Physics 3D Dirac Semimetal Cd₃As₂ The Dirac semimetal cadmium arsenide (Cd3As2), a 3D electronic analog of graphene, has sparked renewed research interests for its novel topological phases and excellent optoelectronic properties. The gapless nature of its 3D electronic band facilitates strong optical nonlinearity and supports Dirac plasmons that are of particular interest to realize high-performance electronic and photonic devices at terahertz (1 THz = 4.1 meV) frequencies, where the performance of most dynamic materials are limited by the tradeoff between power-efficiency and switching speed. Here, all-optical, low-power, ultrafast broadband modulation of terahertz waves using an ultrathin film (100 nm, λ/3000) of Cd3As2 are experimentally demonstrated through active tailoring of the photoconductivity. The measurements reveal the photosensitive metallic behavior of Cd3As2 with high terahertz electron mobility of 7200 cm2 (Vs)−1. In addition, optical fluence dependent ultrafast charge carrier relaxation (15.5 ps), terahertz mobility, and long momentum scattering time (157 fs) comparable to superconductors that invoke kinetic inductance at terahertz frequencies are demonstrated. These remarkable properties of 3D Dirac topological semimetal envision a new class of power-efficient, high speed, compact, tunable electronic, and photonic devices. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) The authors would like to thank Prof. Justin Song for fruitful discussions. R.S and M.M acknowledge the Ministry of Education, Singapore grant numbers AcRF MOE2016-T3-1-006 and MOE AcRF Tier 1 RG96/19. W.L. acknowledges the funding support from National Natural Science Foundation of China (12061131010, 12074198); Tianjin Research Program of Application Foundation and Advanced Technology (20JCYBJCO1040); Fundamental Research Funds for the Central Universities. F.X. was supported by the National Natural Science Foundation of China (11934005, 61322407, 11874116, and 61674040), National Key Research and Development Program of China (Grant No. 2017YFA0303302 and 2018YFA0305601), the Science and Technology Commission of Shanghai (Grant No. 19511120500), and the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01). L.J.W. acknowledges support from the Agency for Science, Technology and Research (A*STAR) Science & Engineering Research Council (Grant No. A1984c0043), and the Nanyang Assistant Professorship Start-up Grant. Z. D acknowledges the China Scholarship Council for financial support (201906200064). 2022-06-29T08:09:55Z 2022-06-29T08:09:55Z 2021 Journal Article Dai, Z., Manjappa, M., Yang, Y., Tan, T. C., Qiang, B., Han, S., Wong, L. J., Xiu, F., Liu, W. & Singh, R. (2021). High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics. Advanced Functional Materials, 31(17), 2011011-. https://dx.doi.org/10.1002/adfm.202011011 1616-301X https://hdl.handle.net/10356/159698 10.1002/adfm.202011011 2-s2.0-85101220739 17 31 2011011 en AcRF MOE2016-T3-1-006 MOE AcRF Tier 1 RG96/19 A1984c0043 Advanced Functional Materials © 2021 Wiley-VCH GmbH. All rights reserved. |
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Science::Physics 3D Dirac Semimetal Cd₃As₂ Dai, Zijie Manjappa, Manukumara Yang, Yunkun Tan, Thomas CaiWei Qiang, Bo Han, Song Wong, Liang Jie Xiu, Faxian Liu, Weiwei Singh, Ranjan High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
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The Dirac semimetal cadmium arsenide (Cd3As2), a 3D electronic analog of graphene, has sparked renewed research interests for its novel topological phases and excellent optoelectronic properties. The gapless nature of its 3D electronic band facilitates strong optical nonlinearity and supports Dirac plasmons that are of particular interest to realize high-performance electronic and photonic devices at terahertz (1 THz = 4.1 meV) frequencies, where the performance of most dynamic materials are limited by the tradeoff between power-efficiency and switching speed. Here, all-optical, low-power, ultrafast broadband modulation of terahertz waves using an ultrathin film (100 nm, λ/3000) of Cd3As2 are experimentally demonstrated through active tailoring of the photoconductivity. The measurements reveal the photosensitive metallic behavior of Cd3As2 with high terahertz electron mobility of 7200 cm2 (Vs)−1. In addition, optical fluence dependent ultrafast charge carrier relaxation (15.5 ps), terahertz mobility, and long momentum scattering time (157 fs) comparable to superconductors that invoke kinetic inductance at terahertz frequencies are demonstrated. These remarkable properties of 3D Dirac topological semimetal envision a new class of power-efficient, high speed, compact, tunable electronic, and photonic devices. |
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School of Physical and Mathematical Sciences |
author_facet |
School of Physical and Mathematical Sciences Dai, Zijie Manjappa, Manukumara Yang, Yunkun Tan, Thomas CaiWei Qiang, Bo Han, Song Wong, Liang Jie Xiu, Faxian Liu, Weiwei Singh, Ranjan |
format |
Article |
author |
Dai, Zijie Manjappa, Manukumara Yang, Yunkun Tan, Thomas CaiWei Qiang, Bo Han, Song Wong, Liang Jie Xiu, Faxian Liu, Weiwei Singh, Ranjan |
author_sort |
Dai, Zijie |
title |
High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
title_short |
High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
title_full |
High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
title_fullStr |
High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
title_full_unstemmed |
High mobility 3D Dirac semimetal (Cd₃As₂) for ultrafast photoactive terahertz photonics |
title_sort |
high mobility 3d dirac semimetal (cd₃as₂) for ultrafast photoactive terahertz photonics |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/159698 |
_version_ |
1738844946040881152 |