arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.01609cond-mat.mtrl-scicond-mat.str-el
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结晶氮与黑磷的电子和光学性质:第一性原理的比较研究

Electronic and optical properties of crystalline nitrogen versus black phosphorus: A comparative first-principles study

Alexander N. Rudenko, Swagata Acharya, Ferenc Tasnádi, Dimitar Pashov, Alena V. Ponomareva, Mark van Schilfgaarde, Igor A. Abrikosov, Mikhail I. Katsnelson

摘要:

结晶黑氮(BN)是最近由两个独立的研究小组在高压下合成的具有黑磷(BP)结构的氮的同素异形体[Ji等人,Sci. Adv. 6,eaba 9206(2020); Laniel等人,物理修订版信函124,216001(2020)]。在这里,我们提出了一个系统的研究BN的电子和光学性质的重点与BP的比较。为此,我们使用国家的最先进的准粒子自洽$GW$的方法与顶点校正的电子和光学通道。尽管有许多相似之处,BN的性质被发现是相当不同的。与BP不同,BN具有更大的光学带隙(2.5对0.26 eV),使BN在可见光谱区透明,具有高度各向异性的光学响应。这种差异可以主要归因于BN中的介电屏蔽的显著降低,从而导致有效库仑相互作用的增强。尽管库仑相互作用相对较强,但这两种材料中激子的形成在很大程度上受到抑制。我们的弹性性能的分析表明BN的刚度非常高,与金刚石相当。

英文摘要:

Crystalline black nitrogen (BN) is an allotrope of nitrogen with the black phosphorus (BP) structure recently synthesized at high pressure by two independent research groups [Ji et al., Sci. Adv. 6, eaba9206 (2020); Laniel et al., Phys. Rev. Lett. 124, 216001 (2020)]. Here, we present a systematic study of the electronic and optical properties of BN focusing on its comparison with BP. To this end, we use the state-of-the-art quasiparticle self-consistent $GW$ approach with vertex corrections in both the electronic and optical channels. Despite many similarities, the properties of BN are found to be considerably different. Unlike BP, BN exhibits a larger optical gap (2.5 vs 0.26 eV), making BN transparent in the visible spectral region with a highly anisotropic optical response. This difference can be primarily attributed to a considerably reduced dielectric screening in BN, leading to enhancement of the effective Coulomb interaction. Despite relatively strong Coulomb interaction, exciton formation is largely suppressed in both materials. Our analysis of the elastic properties shows exceptionally high stiffness of BN, comparable to that of diamond.

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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