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Title: Monolayer RhB4: half-auxeticity and almost ideal spin-orbit Dirac point semimetal
Authors: Gao, Zhen
Wang, Qianqian
Wu, Weikang
Tian, Zhixue
Liu, Ying
Ma, Fengxian
Jiao, Yalong
Yang, Shengyuan A.
Keywords: Science::Physics
Issue Date: 2021
Source: Gao, Z., Wang, Q., Wu, W., Tian, Z., Liu, Y., Ma, F., Jiao, Y. & Yang, S. A. (2021). Monolayer RhB4: half-auxeticity and almost ideal spin-orbit Dirac point semimetal. Physical Review B, 104(24), 245423-1-245423-6.
Project: MOE2019-T2-1-001 
Journal: Physical Review B
Abstract: Structural-property relationship, the connection between materials' structures and their properties, is central to the materials research. Especially at reduced dimensions, novel structural motifs often generate unique physical properties.Motivated by a recent work reporting a novel half auxetic effect in monolayer PdB4 with a hypercoordinated structure, here, we extensively explore similar 2D transition metal boride structures MB4 with M covering 3d and 4d elements.Our investigation screens out one stable candidate, the monolayer RhB4. We find that monolayer RhB4 also shows half auxeticity, i.e., the material always expands in a lateral in-plane direction in response to an applied strain in the other direction, regardless of whether the strain is positive or negative.We show that this special mechanical character is intimately tied to the hypercoordinated structure with the M\c{opyright}B8 structural motif. Furthermore, regarding electronic properties, monolayer RhB4 is found to be the first example of an almost ideal 2D spin-orbit Dirac point semimetal.The low-energy band structure is clean, with a pair of fourfold degenerate Dirac points robust under spin-orbit coupling located close to the Fermi level. These Dirac points are enforced by the nonsymmorphic space group symmetry which is also determined by the lattice structure. Our work deepens the fundamental understanding of structural-property relationship in reduced dimensions. The half auxeticity and the spin-orbit Dirac points will make monolayer RhB4 a promising platform for nanomechanics and nanoelectronics applications.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.104.245423
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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