Non-Monotonic Evolution of Carrier Density and Mobility under Thermal Cycling Treatments in Dirac Semimetal Cd$_{3}$As$_{2}$ Microbelts

doi:10.1088/0256-307X/38/4/047201

Chin. Phys. Lett.

2021, Vol. 38

Issue (4): 047201 DOI: 10.1088/0256-307X/38/4/047201

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Non-Monotonic Evolution of Carrier Density and Mobility under Thermal Cycling Treatments in Dirac Semimetal Cd$_{3}$As$_{2}$ Microbelts

Zheng Chen^1,2†, Min Wu^1,2†, Yequn Liu³, Wenshuai Gao⁴, Yuyan Han¹, Jianhui Zhou^1*, Wei Ning^1*, and Mingliang Tian^1,4

¹Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
²Department of Physics, University of Science and Technology of China, Hefei 230026, China
³Analytical Instrumentation Center, State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
⁴Department of Physics, School of Physics and Materials Science, Anhui University, Hefei 230601, China

Cite this article:

Zheng Chen, Min Wu, Yequn Liu et al 2021 Chin. Phys. Lett. 38 047201

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Abstract Tunable carrier density plays a key role in the investigation of novel transport properties in three-dimensional topological semimetals. We demonstrate that the carrier density, as well as the mobility, of Dirac semimetal Cd$_{3}$As$_{2}$ nanoplates can be effectively tuned via in situ thermal treatment at 350 K for one hour, resulting in non-monotonic evolution by virtue of the thermal cycling treatments. The upward shift of Fermi level relative to the Dirac nodes blurs the surface Fermi-arc states, accompanied by an anomalous phase shift in the oscillations of bulk states, due to a change in the topology of the electrons. Meanwhile, the oscillation peaks of bulk longitudinal magnetoresistivity shift at high fields, due to their coupling to the oscillations of the surface Fermi-arc states. Our work provides a thermal control mechanism for the manipulation of quantum states in Dirac semimetal Cd$_{3}$As$_{2}$ at high temperatures, via their carrier density.

Received: 18 December 2020 Published: 06 April 2021

PACS:	72.15.Eb	(Electrical and thermal conduction in crystalline metals and alloys)
	72.90.+y	(Other topics in electronic transport in condensed matter)
	81.16.Nd	(Micro- and nanolithography)

Fund: Supported by the National Key Research and Development Program of China (Grant No. 2016YFA0401003), and the National Natural Science Foundation of China (Grant Nos. 11804340, 11774353, U19A2093, and U1732274), and the CAS/SAFEA International Partnership Program for Creative Research Teams of China.

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https://cpl.iphy.ac.cn/10.1088/0256-307X/38/4/047201 OR https://cpl.iphy.ac.cn/Y2021/V38/I4/047201

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	Zheng Chen
	Min Wu
	Yequn Liu
	Wenshuai Gao
	Yuyan Han
	Jianhui Zhou
	Wei Ning
	and Mingliang Tian

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