Quasiparticle band structure and optical spectrum of LiF(001) -: art. no. 115111

被引：47

作者：

Wang, NP ^{[1
]}

Rohlfing, M ^{[1
]}

Krüger, P ^{[1
]}

Pollmann, J ^{[1
]}

机构：

[1] Univ Munster, Inst Festkorpertheorie, D-48149 Munster, Germany

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.67.115111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the quasiparticle band structure and the optical excitation spectrum of bulk LiF and the LiF(001)-(1x1) surface. First, we calculate the ground-state geometry of the bulk and the surface using density-functional theory within the local-density approximation. Next, applying the GW approximation for the self-energy, we evaluate the corresponding quasiparticle band structure. Finally, we calculate the electron-hole interaction, solve the Bethe-Salpeter equation for the two-particle Green function, and investigate the optical-absorption spectrum. The obtained spectrum of bulk LiF, which is dominated by a strong exciton peak at 12.7 eV, is in good agreement with experiment. At the LiF(001)-(1x1) surface, the excitonic effects are strongly modified with respect to the bulk. In particular, we observe a surface exciton at 12.3 eV, i.e., 0.4 eV below the bulk exciton.

引用

页数：11

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