Analysis of the exciton-LO-phonon coupling in single wurtzite GaN quantum dots

被引：21

作者：

Callsen, G. ^{[1
]}

Pahn, Gerald M. O. ^{[1
]}

Kalinowski, S. ^{[1
]}

Kindel, C. ^{[1
]}

Settke, J. ^{[1
]}

Brunnmeier, J. ^{[1
]}

Nenstiel, C. ^{[1
]}

Kure, T. ^{[1
]}

Nippert, F. ^{[1
]}

Schliwa, A. ^{[1
]}

Hoffmann, A. ^{[1
]}

Markurt, T. ^{[2
]}

Schulz, T. ^{[2
]}

Albrecht, M. ^{[2
]}

Kako, S. ^{[3
]}

Arita, M. ^{[3
]}

Arakawa, Y. ^{[3
]}

机构：

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

[2] Leibniz Inst Kristallzuchtung, D-12489 Berlin, Germany

[3] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 23期

关键词：

CHEMICAL-VAPOR-DEPOSITION; OPTICAL-PROPERTIES; SEMICONDUCTOR MICROCRYSTALLITES; SPECTRAL DIFFUSION; BAND PARAMETERS; STATES; SCATTERING; COMPLEXES; DENSITY; WELLS;

D O I：

10.1103/PhysRevB.92.235439

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, we analyze the interaction between excitons and longitudinal-optical phonons (LO phonons) in single, wurtzite GaN quantum dots (QDs) by means of micro-photoluminescence (mu PL) spectroscopy. We report on Stokes-shifted emission lines measured for hundreds of single QDs. A decrease of the Huang-Rhys factor (similar to 0.5-0.01) is observed with increasing QD emission energy that can be modeled in an adiabatic approximation applying two-particle eight-band k.p wave functions. In order to obtain the QD dimensions and shape needed for these calculations, we conduct a scanning transmission electron microscope (STEM) analysis, not only focusing on the QD dimensions, but also on alloying effects. The QD height is identified as the most detrimental parameter for the exciton-LO-phonon interaction in strongly polar QD systems based on nitrides. Additionally, we extract the LO-phonon energy for a significant number of individual QDs from our mu PL data set scaling in-between the bulk values for the QD (GaN) and the matrix material (AlN). Such a large variation of the LO-phonon energy cannot be explained by the alloying effects attested by our STEM analysis. Hence, the exciton-LO-phonon interaction resides in a volume that encloses the QD in the growth direction and a fraction of the matrix material depending on the QD height. We approximate this exciton-LO-phonon interaction volume by a sphere with a constant diameter of 2.6 +/- 0.2 nm.

引用

页数：14

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