Comparative Studies on The Optical Properties of Different Strained Ge:A First-principles Calculation

被引：0

作者：

Li J. ^{[1
]}

Huang W.-Q. ^{[2
]}

Zhang P. ^{[1
]}

Lyu Y.-Y. ^{[1
]}

Han X.-H. ^{[1
]}

Lu G.-W. ^{[1
]}

机构：

[1] College of Science, China University of Petroleum, Beijing

[2] College of Science, Beijing University of Science and Technology Information, Beijing

来源：

Faguang Xuebao/Chinese Journal of Luminescence | 2017年 / 38卷 / 06期

关键词：

First principle; Ge; Optical properties; Strain;

D O I：

10.3788/fgxb20173806.0702

中图分类号：

学科分类号：

摘要：

To explore the changes of the optical properties for Ge in different orientations and different strains, we performed the first principle calculations based on density functional theory combined with GGA+U approach. The results show that Ge undergoes a transition from indirect- to direct-gap on uniaxially tensile strains (along [100], [110] and [111] directions) and biaxially tensile strains (parallel to (100), (110) planes).The band gaps of Ge with uniaxially strains (along [110] and [111] directions) are higher than those with biaxially strains, and the transition points of uniaxially strains are lower than those of biaxially strains. Under uniaxially and biaxially compressive strains, the changes of dielectric constants and loss factors of Ge between the frequency bands are both negligible. However, the dielectric constants and loss factors rise first and then fall in a definite range of strains when Ge is under uniaxially and biaxially tensile strains. Compared with unstrained Ge, Ge under [111] 1.22% strain possesses excellent optical properties: reasonable forbidden bandwidth, higher static dielectric, higher absorption coefficient, lower loss function and lower strains. © 2017, Science Press. All right reserved.

引用

页码：702 / 708

页数：6

共 24 条

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