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arXiv 2210.09686cond-mat.mtrl-sci
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二维Janus Cr$_2$TeX(X= P, As, Sb)单层力学、电子、磁学和光学性质的第一性原理计算

First-principles calculations on the mechanical, electronic, magnetic and optical properties of two-dimensional Janus Cr$_2$TeX (X= P, As, Sb) monolayers

Qiuyue Ma, Wenhui Wan, Yanfeng Ge, Yingmei Li, Yong Liu

AI总结:

本研究通过第一性原理计算系统探究二维Janus Cr$_2$TeX单层的多类物理性质,发现其为本征铁磁半金属,居里温度较高,宽应变范围下保持特性且可见光吸收性能有差异,为纳米器件应用提供候选材料。

摘要:

Janus材料因对称性破缺具备优异的物理、化学和力学性能。本文采用密度泛函理论,系统研究了Janus Cr$_2$TeX(X= P, As, Sb)单层的力学性质、电子结构、磁学性质和光学性质。Janus Cr$_2$TeP、Cr$_2$TeAs和Cr$_2$TeSb是本征铁磁(FM)半金属,具有较宽的自旋带隙和半金属带隙。基于海森堡模型的蒙特卡洛模拟估算,这三种单层的居里温度($T_c$)分别约为583 K、608 K和597 K。此外,研究发现Cr$_2$TeX(X= P, As, Sb)单层在-6%到6%的双轴应变下仍保持铁磁半金属特性。最后,Cr$_2$TeP单层在可见光区域的吸收系数高于Cr$_2$TeAs和Cr$_2$TeSb单层。研究结果表明,具有新颖性质的Janus Cr$_2$TeX(X= P, As, Sb)单层在未来纳米器件中具备良好的应用潜力。

英文摘要:

Janus materials possess extraordinary physical, chemical, and mechanical properties caused by symmetry breaking. Here, the mechanic properties, electronic structure, magnetic properties, and optical properties of Janus Cr$_2$TeX (X= P, As, Sb) monolayers are systematically investigated by the density functional theory. Janus Cr$_2$TeP, Cr$_2$TeAs, and Cr$_2$TeSb are intrinsic ferromagnetic (FM) half-metals with wide spin gaps and half-metallic gaps. Monte Carlo simulations based on the Heisenberg model estimate the Curie temperature (\emph{T}$_c$) of these monolayers are about 583, 608, and 597 K, respectively. Additionally, it is found that Cr$_2$TeX (X= P, As, Sb) monolayers still exhibit FM half-metallic properties under biaxial strain from -6% to 6%. At last, the Cr$_2$TeP monolayer has a higher absorption coefficient than the Cr$_2$TeAs and Cr$_2$TeSb monolayers in the visible region. The results predict that Janus Cr$_2$TeX (X= P, As, Sb) monolayers with novel properties have good potential for applications in future nanodevices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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