Optical anisotropy and the direction of polarization of exciton emissions in a semiconductor quantum dot:Effect of heavy- and light-hole mixing

doi:10.1088/1674-1056/26/8/087303

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Abstract

The dependence of the directions of polarization of exciton emissions, fine structure splittings (FSS), and polarization anisotropy on the light- and heavy-hole (LH-HH) mixing in semiconductor quantum dots (QDs) is investigated using a mesoscopic model. In general, all QDs have a four-fold exciton ground state. Two exciton states have directions of polarization in the growth-plane, while the other two are along the growth direction of the QD. The LH-HH mixing does affect the FSS and polarization anisotropy of bright exciton states in the growth-plane in the low symmetry QDs (e.g., C_2V, C_S, C₁), while it has no effect on the FSS and polarization anisotropy in high symmetry QDs (e.g., C_3V, D_2d). When the hole ground state is pure HH or LH, the bright exciton states in the growth-plane are normal to each other. The LH-HH mixing affects the relative intensities and directions of bright exciton states in the growth-plane of the QD. The polarization anisotropy of exciton emissions in the growth-plane of the QD is independent of the phase angle of LH-HH mixing but strongly depends on the magnitude of LH-HH mixing in low symmetry QDs.

Key words： light-heavy hole mixing excitons quantum dots

Received: 19 February 2017

PACS:	73.21.La	(Quantum dots)
	78.67.Hc	(Quantum dots)

Corresponding Authors: Ranber Singh

E-mail: ranber14@gmail.com

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	Ranber Singh
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	Vikramjeet Singh

Cite this article:

Ranber Singh,Rajiv Kumar,Vikramjeet Singh. Optical anisotropy and the direction of polarization of exciton emissions in a semiconductor quantum dot:Effect of heavy- and light-hole mixing[J]. Chin. Phys. B, 2017, 26(8):087303.

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http://cpb.iphy.ac.cn/EN/10.1088/1674-1056/26/8/087303 OR http://cpb.iphy.ac.cn/EN/Y2017/V26/I8/87303

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