Excitons in germanium nanowires: Quantum confinement, orientation, and anisotropy effects within a first-principles approach

被引：93

作者：

Bruno, M

Palummo, M

Marini, A

Del Sole, R

Olevano, V

Kholod, AN

Ossicini, S

机构：

[1] Univ Roma Tor Vergata, ETSF, I-00133 Rome, Italy

[2] Univ Roma Tor Vergata, Dipartimento Fis, INFM, CNR, I-00133 Rome, Italy

[3] CNRS, ETSF, F-38042 Grenoble, France

[4] CNRS, LEPES, F-38042 Grenoble, France

[5] Fed Off Commun, CH-2501 Biel, Switzerland

[6] Univ Modena & Reggio Emilia, Dipartimento Sci & Metodi Ingn, I-42100 Reggio Emilia, Italy

[7] Univ Modena & Reggio Emilia, INFM, Natl Ctr Nanostruct & Biosyst Surfaces S3, I-42100 Reggio Emilia, Italy

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.72.153310

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Within a first-principles framework we show how many-body effects crucially modify the electronic and optical properties of free-standing Germanium nanowires. The electron-hole binding energy and probability distribution are found to depend on both wire size and orientation. Moreover, we observe an almost complete compensation of self-energy and excitonic effects for some of the analyzed quantum wires, which we explain as being due to their clusterlike atomic structure.

引用

页数：4

共 49 条

[1] Enhanced quantum efficiency of solar cells with self-assembled Ge dots stacked in multilayer structure [J].