Surface current properties of ZrTe<sub>5 </sub>excited by ultrafast laser

doi:10.11972/j.issn.1001-9014.2022.04.012

Home > Archive>Volume 41, Issue 4, 2022 >733-738. DOI:10.11972/j.issn.1001-9014.2022.04.012

Surface current properties of ZrTe5 excited by ultrafast laser
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                        10.11972/j.issn.1001-9014.2022.04.012
                    
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                        LUY Hai-Hui1LUY Hai-Hui
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China
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LI Min1LI Min
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China
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XIA Yu1XIA Yu
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China
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LIU Zheng1LIU Zheng
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China
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HE Ming-Yang3HE Ming-Yang
Jinan Institute of Quantum Technology， Jinan 250101 China
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YUAN Shuai1YUAN Shuai
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China
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ZENG He-Ping1,2,3,4ZENG He-Ping
School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China;State Key Laboratory of Precision Spectroscopy， East China Normal University， Shanghai 200062 China;Jinan Institute of Quantum Technology， Jinan 250101 China;Chongqing Institute of East China Normal University， Chongqing 401121 China
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Affiliation:1.School of Optical Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093 China;2.State Key Laboratory of Precision Spectroscopy， East China Normal University， Shanghai 200062 China;3.Jinan Institute of Quantum Technology， Jinan 250101 China;4.Chongqing Institute of East China Normal University， Chongqing 401121 China
Clc Number:O43
Fund Project:Supported by National Natural Science Foundation of China （11727812， 61927813）

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Abstract:

The transient photocurrent generated by femtosecond laser excitation on the surface of Dirac semimetal ZrTe₅ were measured through the reflected terahertz time-domain spectroscopy. Experimental results reveal several physical mechanisms of terahertz radiation generated from ZrTe₅. The results show that the polarization-independent photocurrent is the main component of the surface current， and the terahertz amplitude is related to polarization of the pump laser pulse， which indicates that part of the current is caused by nonlinear optical rectification effect. Under circularly polarized laser pumping， the terahertz amplitude changes four times periodically with the pump laser pulse， which confirms that circular photogalvanic effect of ZrTe₅. Besides， we have analyzed the terahertz time-domain electric field excited by ultrashort laser pulses. The ZrTe₅ inversion symmetry is broken under the excitation of the femtosecond laser pulse， which produces B_1u phonons， forming a transient Weyl point， and undergoing a phase transition from the Dirac state to the Weyl state. This is of great significance to the study of topological phase transitions and other topological states.

Key words:terahertz spectroscopy;Dirac materials;ZrTe₅;circular photogalvanic effect

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LUY Hai-Hui, LI Min, XIA Yu, LIU Zheng, HE Ming-Yang, YUAN Shuai, ZENG He-Ping. Surface current properties of ZrTe₅excited by ultrafast laser[J]. Journal of Infrared and Millimeter Waves,2022,41(4):733~738

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Received:December 08,2021
Revised:August 13,2022
Adopted:January 11,2022
Online: August 10,2022
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