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Two-dimensional tetragonal ZnB: A nodalline semimetal with good transport properties |
| Yong-Chun Zhao(赵永春)1, Ming-Xin Zhu(朱铭鑫)1, Sheng-Shi Li(李胜世)2, and Ping Li(李萍)1,† |
1 School of Physics and Technology, University of Jinan, Jinan 250022, China;
2 Institute of Spintronics, University of Jinan, Jinan 250022, China |
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Abstract Nodal-line semimetals have become a research hot-spot due to their novel properties and great potential application in spin electronics. It is more challenging to find 2D nodal-line semimetals that can resist the spin-orbit coupling (SOC) effect. Here, we predict that 2D tetragonal ZnB is a nodal-line semimetal with great transport properties. There are two crossing bands centered on the $S$ point at the Fermi surface without SOC, which are mainly composed of the ${\rm p}_{xy}$ orbitals of Zn and B atoms and the ${\rm p}_{z}$ orbitals of the B atom. Therefore, the system presents a nodal line centered on the $S$ point in its Brillouin zone (BZ). And the nodal line is protected by the horizontal mirror symmetry $M_{z}$. We further examine the robustness of a nodal line under biaxial strain by applying up to $-4%$ in-plane compressive strain and 5% tensile strain on the ZnB monolayer, respectively. The transmission along the $a$ direction is significantly stronger than that along the $b$ direction in the conductive channel. The current in the $a$ direction is as high as 26.63 μA at 0.8 V, and that in the $b$ direction reaches 8.68 μA at 0.8 V. It is interesting that the transport characteristics of ZnB show the negative differential resistance (NDR) effect after 0.8 V along the $a (b)$ direction. The results provide an ideal platform for research of fundamental physics of 2D nodal-line fermions and nanoscale spintronics, as well as the design of new quantum devices.
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Received: 19 May 2022
Revised: 30 August 2022
Accepted manuscript online: 05 September 2022
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PACS:
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73.20.At
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(Surface states, band structure, electron density of states)
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62.20.D-
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(Elasticity)
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72.10.-d
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(Theory of electronic transport; scattering mechanisms)
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| Fund: Project supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2019MA041), Taishan Scholar Project of Shandong Province, China (Grant No. ts20190939), and the National Natural Science Foundation of China (Grant No. 62071200). |
Corresponding Authors:
Ping Li
E-mail: ss_lip@ujn.edu.cn
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Cite this article:
Yong-Chun Zhao(赵永春), Ming-Xin Zhu(朱铭鑫), Sheng-Shi Li(李胜世), and Ping Li(李萍) Two-dimensional tetragonal ZnB: A nodalline semimetal with good transport properties 2023 Chin. Phys. B 32 067301
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