Applied Physics Letters, volume 115, issue 20, pages 202104

Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP₂ Wigner molecule structures

K. Sun ^{1, 2}

D. V. Lebedev ¹

N Bert ¹

K.G. Belyaev ¹

V. N. NEVEDOMSKIY ¹

Maxim V. Rakhlin ¹

Alexey A. Toropov ¹

A S Vlasov ¹

Agnieszka M. Gocalinska ³

Gediminas Juska ³

E. Pelucchi ³

M A Arredondo ⁴

Aaron B. Naden ^{4, 5}

Artem V. Shelaev ⁶

V. A. Bykov ⁶

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Ioffe Institute, Saint Petersburg 1 , 194021, Russia |

University of Notre Dame, Notre Dame 2 Electrical Engineering Department, , Indiana 46556, USA |

Tyndall National Institute, University College Cork 3 , Cork, T12R5CP, Ireland |

⁴

School of Mathematics and Physics, Queen's University Belfast 4 , Belfast, BT7 1NN, United Kingdom |

⁵

School of Chemistry, University of St Andrews 5 , St Andrews, KY16 9ST, United Kingdom |

⁶

NT-MDT Co 6 , Zelenograd, Moscow 124460, Russia |

Publication type: Journal Article

Publication date: 2019-11-11

AIP Publishing

Journal: Applied Physics Letters

scimago Q1

SJR: 0.976

CiteScore: 6.4

Impact factor: 3.5

ISSN: 00036951, 10773118

DOI: 10.1063/1.5126527

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Physics and Astronomy (miscellaneous)

Abstract

We used transmission electron microscopy, Raman, and photoluminescence spectroscopy to identify the effect of CuPt-type GaP-InP atomic ordering (AO) on the structural and emission properties of self-organized (SO) InP/GaInP2 Wigner molecule (WM) quantum dot (QD) structures. We found that the correlation of AO and SO growth results in the formation of InP/GaInP2 QD/AO-domain (QD/AOD) core-shell composites. This observation shows that intrinsic WMs in this system emerge due to a strong piezoelectric field generated by AODs, which induces QD doping and a built-in magnetic field. We found that the bond relaxation of AODs leads to a decrease in the emission energy of WMs of 80 meV. The photoluminescence spectra of single WMs having an emission energy ∼1.53 eV are presented here, the lowest one reported for this system.

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Publisher

AIP Publishing

Journal

Applied Physics Letters

scimago Q1

SJR

0.976

CiteScore

6.4

Impact factor

3.5

ISSN

00036951 (Print)

10773118 (Electronic)

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Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP₂ Wigner molecule structures

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Atomic ordering and bond relaxation in optical spectra of self-organized InP/GaInP₂ Wigner molecule structures