首页|Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2

Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd2As2

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EuCd2As2 was theoretically predicted to be a minimal model of Weyl semimetals with a single pair of Weyl points in the ferromagnet state.However,the heavily p-doped EuCd2As2 crystals in previous experiments prevent direct identification of the semimetal hypothesis.Here,we present a comprehensive magneto-transport study of high-quality EuCd2As2 crystals with ultralow bulk carrier density(1013 cm-3).In contrast to the general expectation of a Weyl semimetal phase,EuCd2As2 shows insulating behavior in both antiferromagnetic and ferromagnetic states as well as surface-dominated conduction from band bending.Moreover,the application of a dc bias current can dramatically modulate the resistance by over one order of magnitude,and induce a periodic resistance oscillation due to the geometric resonance.Such nonlinear transport results from the high nonequilibrium state induced by an electrical field near the band edge.Our results suggest an insulating phase in EuCd2As2 and put a strong constraint on the underlying mechanism of anomalous transport properties in this system.

magnetic Weyl semimetalquantum transportHall effectnonlinear resistivity

Yuxiang Wang、Jianwen Ma、Jian Yuan、Wenbin Wu、Yong Zhang、Yicheng Mou、Jiaming Gu、Peihong Cheng、Wu Shi、Xiang Yuan、Jinglei Zhang、Yanfeng Guo、Cheng Zhang

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State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing,Fudan University,Shanghai 200433,China

School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China

State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200241,China

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China

Zhangjiang Fudan International Innovation Center,Fudan University,Shanghai 201210,China

School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China

ShanghaiTech Laboratory for Topological Physics,Shanghai 201210,China

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国家重点研发计划国家自然科学基金国家自然科学基金Shuguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education CommissionDouble First-Class Initiative Fund of Shanghai Tech Universityopen project from Beijing National Laboratory for Condensed Matter Physics国家重点研发计划国家自然科学基金国家自然科学基金上海市自然科学基金

2022YFA140570012174069923651042022YFA1602603121224111227409022ZR1406300

2024

10.1007/s11433-023-2283-0

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(4)
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