Identification of electric dipole moments of excitonic complexes in nitride-based quantum dots

被引：25

作者：

Hoenig, Gerald ^{[1
]}

Rodt, Sven ^{[1
]}

Callsen, Gordon ^{[1
]}

Ostapenko, Irina A. ^{[1
]}

Kure, Thomas ^{[1
]}

Schliwa, Andrei ^{[1
]}

Kindel, Christian ^{[1
]}

Bimberg, Dieter ^{[1
,2
]}

Hoffmann, Axel ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

[2] King Abdulaziz Univ, Jeddah 21413, Saudi Arabia

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 04期

关键词：

FIELD;

D O I：

10.1103/PhysRevB.88.045309

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The built-in dipole moments of excitonic and multiexcitonic complexes of GaN/AlN quantum dots (charged and uncharged excitons and biexcitons) are investigated in detail, both experimentally and theoretically. The calculations are done with Hartree-Fock wave functions in the framework of an 8-band k . p approximation. Electric dipole moments of different excitonic complexes are found to vary significantly. Hence, their Coulomb coupling to charged defects in the vicinity of a QD produces emission energy variations, known as spectral diffusion, which can be used to identify the emitting excitonic complex. This method was exemplary applied to the presented cathodoluminescence and mu-photoluminescence data and opens a way to identify excitonic complexes by their response to external electric fields.

引用

页数：10

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