Electrical transport and optical properties of Cd3As2 thin films

doi:10.1088/1674-1056/ab3a91

Abstract Cd₃As₂, as a three-dimensional (3D) topological Dirac semimetal, has attracted wide attention due to its unique physical properties originating from the 3D massless Dirac fermions. While many efforts have been devoted to the exploration of novel physical phenomena such as chiral anomaly and phase transitions by using bulk crystals, the development of high-quality and large-scale thin films becomes necessary for practical electronic and optical applications. Here, we report our recent progress in developing single-crystalline thin films with improved quality and their optical devices including Cd₃As₂-based heterojunctions and ultrafast optical switches. We find that a post-annealing process can significantly enhance the crystallinity of Cd₃As₂ in both intrinsic and Zn-doped thin films. With excellent characteristics of high mobility and linear band dispersion, Cd₃As₂ exhibits a good optical response in the visible-to-mid-infrared range due to an advantageous optical absorption, which is reminiscent of 3D graphene. It also behaves as an excellent saturable absorber in the mid-infrared regime. Through the delicate doping process in this material system, it may further open up the long-sought parameter space crucial for the development of compact and high-performance mid-infrared ultrafast sources.

Keywords: topological Dirac semimetals thin films photodetectors ultra-fast optical switches

Received: 17 July 2019
Revised: 08 August 2019
Accepted manuscript online:

PACS:	75.47.-m	(Magnetotransport phenomena; materials for magnetotransport)
	75.70.Tj	(Spin-orbit effects)
	73.43.-f	(Quantum Hall effects)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303302 and 2018YFA0305601) and the National Natural Science Foundation of China (Grant Nos. 61322407, 11474058, 61674040, and 11874116).

Corresponding Authors: Yi Shi
E-mail: yshi@nju.edu.cn

Cite this article:

Yun-Kun Yang(杨运坤), Fa-Xian Xiu(修发贤), Feng-Qiu Wang(王枫秋), Jun Wang(王军), Yi Shi(施毅) Electrical transport and optical properties of Cd₃As₂ thin films 2019 Chin. Phys. B 28 107502

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Electrical transport and optical properties of Cd₃As₂ thin films