Many-body effects in silicene, silicane, germanene and germanane

被引：119

作者：

Wei, Wei ^{[1
,2
]}

Dai, Ying ^{[1
]}

Huang, Baibiao ^{[1
]}

Jacob, Timo ^{[2
]}

机构：

[1] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China

[2] Univ Ulm, Inst Electrochem, D-89081 Ulm, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 22期

基金：

中国国家自然科学基金;

关键词：

ELECTRON-HOLE EXCITATIONS; OPTICAL-SPECTRA; GRAPHENE;

D O I：

10.1039/c3cp51078f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Silicene, which is the silicon equivalent of carbon-based graphene and shares some of the unique properties with graphene, has been attracting more and more attention since its synthesis and represents a breakthrough in current silicon-based technology. In this work, many-body effects in silicene, silicane, germanene and germanane have been demonstrated based on the Green's function perturbation theory, i.e., GW + Bethe-Salpeter equation. Due to confinement, many-body effects play a pivotal role in quasi-particle excitations and optical absorption spectra, which leads to excitonic resonance (pi -> pi* excitation) in silicene and germanene, and strongly bound excitons in silicane and germanane with considerable binding energies.

引用

页码：8789 / 8794

页数：6

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