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Extended excitons and compact heliumlike biexcitons in type-II quantum dots.

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Extended excitons and compact heliumlike biexcitons in type-II quantum dots. / Bansal, Bhavtosh; Godefroo, Stefanie; Hayne, Manus et al.
In: Physical review B, Vol. 80, No. 20, 205137, 18.11.2009.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bansal, B, Godefroo, S, Hayne, M, Medeiros-Ribeiro, G & Moshchalkov, V 2009, 'Extended excitons and compact heliumlike biexcitons in type-II quantum dots.', Physical review B, vol. 80, no. 20, 205137. https://doi.org/10.1103/PhysRevB.80.205317

APA

Bansal, B., Godefroo, S., Hayne, M., Medeiros-Ribeiro, G., & Moshchalkov, V. (2009). Extended excitons and compact heliumlike biexcitons in type-II quantum dots. Physical review B, 80(20), Article 205137. https://doi.org/10.1103/PhysRevB.80.205317

Vancouver

Bansal B, Godefroo S, Hayne M, Medeiros-Ribeiro G, Moshchalkov V. Extended excitons and compact heliumlike biexcitons in type-II quantum dots. Physical review B. 2009 Nov 18;80(20):205137. doi: 10.1103/PhysRevB.80.205317

Author

Bansal, Bhavtosh ; Godefroo, Stefanie ; Hayne, Manus et al. / Extended excitons and compact heliumlike biexcitons in type-II quantum dots. In: Physical review B. 2009 ; Vol. 80, No. 20.

Bibtex

@article{e89196c9a1754b85a53588a5f6a50f04,
title = "Extended excitons and compact heliumlike biexcitons in type-II quantum dots.",
abstract = "We have used magneto-photoluminescence measurements to establish that InP/GaAs quantum dots have a type-II band (staggered) alignment. The average excitonic Bohr radius and the binding energy are estimated to be 15 nm and 1.5 meV respectively. When compared to bulk InP, the excitonic binding is weaker due to the repulsive (type-II) potential at the hetero-interface. The measurements are extended to over almost six orders of magnitude of laser excitation powers and to magnetic fields of up to 50 tesla. It is shown that the excitation power can be used to tune the average hole occupancy of the quantum dots, and hence the strength of the electron-hole binding. The diamagnetic shift coe±cient is observed to drastically reduce as the quantum dot ensemble makes a gradual transition from a regime where the emission is from (hydrogen-like) two-particle excitonic states to a regime where the emission from (helium-like) four-particle biexcitonic states also become significant.",
keywords = "type-II, quantum dots, exciton, hydrogen, heliium",
author = "Bhavtosh Bansal and Stefanie Godefroo and Manus Hayne and Gilberto Medeiros-Ribeiro and Victor Moshchalkov",
note = "{\textcopyright}2009 The American Physical Society",
year = "2009",
month = nov,
day = "18",
doi = "10.1103/PhysRevB.80.205317",
language = "English",
volume = "80",
journal = "Physical review B",
issn = "1098-0121",
publisher = "AMER PHYSICAL SOC",
number = "20",

}

RIS

TY - JOUR

T1 - Extended excitons and compact heliumlike biexcitons in type-II quantum dots.

AU - Bansal, Bhavtosh

AU - Godefroo, Stefanie

AU - Hayne, Manus

AU - Medeiros-Ribeiro, Gilberto

AU - Moshchalkov, Victor

N1 - ©2009 The American Physical Society

PY - 2009/11/18

Y1 - 2009/11/18

N2 - We have used magneto-photoluminescence measurements to establish that InP/GaAs quantum dots have a type-II band (staggered) alignment. The average excitonic Bohr radius and the binding energy are estimated to be 15 nm and 1.5 meV respectively. When compared to bulk InP, the excitonic binding is weaker due to the repulsive (type-II) potential at the hetero-interface. The measurements are extended to over almost six orders of magnitude of laser excitation powers and to magnetic fields of up to 50 tesla. It is shown that the excitation power can be used to tune the average hole occupancy of the quantum dots, and hence the strength of the electron-hole binding. The diamagnetic shift coe±cient is observed to drastically reduce as the quantum dot ensemble makes a gradual transition from a regime where the emission is from (hydrogen-like) two-particle excitonic states to a regime where the emission from (helium-like) four-particle biexcitonic states also become significant.

AB - We have used magneto-photoluminescence measurements to establish that InP/GaAs quantum dots have a type-II band (staggered) alignment. The average excitonic Bohr radius and the binding energy are estimated to be 15 nm and 1.5 meV respectively. When compared to bulk InP, the excitonic binding is weaker due to the repulsive (type-II) potential at the hetero-interface. The measurements are extended to over almost six orders of magnitude of laser excitation powers and to magnetic fields of up to 50 tesla. It is shown that the excitation power can be used to tune the average hole occupancy of the quantum dots, and hence the strength of the electron-hole binding. The diamagnetic shift coe±cient is observed to drastically reduce as the quantum dot ensemble makes a gradual transition from a regime where the emission is from (hydrogen-like) two-particle excitonic states to a regime where the emission from (helium-like) four-particle biexcitonic states also become significant.

KW - type-II

KW - quantum dots

KW - exciton

KW - hydrogen

KW - heliium

UR - http://www.scopus.com/inward/record.url?scp=77954719356&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.80.205317

DO - 10.1103/PhysRevB.80.205317

M3 - Journal article

VL - 80

JO - Physical review B

JF - Physical review B

SN - 1098-0121

IS - 20

M1 - 205137

ER -