Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

Heedae Kim; Seongho Park; Rin Okuyama; Kwangseuk Kyhm; Mikio Eto; Robert A. Taylor; Gilles Nogues; Le Si Dang; Marek Potemski; Koochul Je; Jongsu Kim; Jihoon Kyhm; Jindong Song

doi:10.1021/acs.nanolett.8b02131

Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

Heedae Kim, Seongho Park, Rin Okuyama, Kwangseuk Kyhm, Mikio Eto, Robert A. Taylor, Gilles Nogues, Le Si Dang, Marek Potemski, Koochul Je, Jongsu Kim, Jihoon Kyhm, Jindong Song

Department of Physics

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAlAs quantum ring can be controlled by excitation intensity. With a weak excitation intensity of 1.2 kW cm^-2, the optical Aharonov-Bohm oscillation period of biexcitons was observed to be half that of excitons in accordance with the period expected for a two-exciton Wigner molecule. When the excitation intensity is increased by an order of magnitude (12 kW cm^-2), a gradual deviation of the Wigner molecule condition occurs with decreased oscillation periods and diamagnetic coefficients for both excitons and biexcitons along with a spectral shift. These results suggest that the effective orbit radii and rim widths of electrons and holes in a single quantum ring can be modified by light intensity via photoexcited carriers, which are possibly trapped at interface defects resulting in a local electric field.

Original language	English
Pages (from-to)	6188-6194
Number of pages	7
Journal	Nano Letters
Volume	18
Issue number	10
DOIs	https://doi.org/10.1021/acs.nanolett.8b02131
Publication status	Published - 2018 Oct 10

Keywords

Aharonovâ'Bohm effect
Quantum rings
excitons
light excitation
photoluminescence

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/acs.nanolett.8b02131

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@article{2eeccb5a8fe84c1ba6ea2e159a1932b8,

title = "Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring",

abstract = "We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAlAs quantum ring can be controlled by excitation intensity. With a weak excitation intensity of 1.2 kW cm-2, the optical Aharonov-Bohm oscillation period of biexcitons was observed to be half that of excitons in accordance with the period expected for a two-exciton Wigner molecule. When the excitation intensity is increased by an order of magnitude (12 kW cm-2), a gradual deviation of the Wigner molecule condition occurs with decreased oscillation periods and diamagnetic coefficients for both excitons and biexcitons along with a spectral shift. These results suggest that the effective orbit radii and rim widths of electrons and holes in a single quantum ring can be modified by light intensity via photoexcited carriers, which are possibly trapped at interface defects resulting in a local electric field.",

keywords = "Aharonov{\^a}'Bohm effect, Quantum rings, excitons, light excitation, photoluminescence",

author = "Heedae Kim and Seongho Park and Rin Okuyama and Kwangseuk Kyhm and Mikio Eto and Taylor, {Robert A.} and Gilles Nogues and Dang, {Le Si} and Marek Potemski and Koochul Je and Jongsu Kim and Jihoon Kyhm and Jindong Song",

note = "Funding Information: This work was supported by Korean Grant (NRF-2017R1A2B4011594, Pioneer Research 2013M3C1A3065522), JSPS KAKENHI Grant (JP15H05870, JP26220711), and Fundamental Research Funds for Central University of China. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = oct,

day = "10",

doi = "10.1021/acs.nanolett.8b02131",

language = "English",

volume = "18",

pages = "6188--6194",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "10",

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TY - JOUR

T1 - Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

AU - Kim, Heedae

AU - Park, Seongho

AU - Okuyama, Rin

AU - Kyhm, Kwangseuk

AU - Eto, Mikio

AU - Taylor, Robert A.

AU - Nogues, Gilles

AU - Dang, Le Si

AU - Potemski, Marek

AU - Je, Koochul

AU - Kim, Jongsu

AU - Kyhm, Jihoon

AU - Song, Jindong

N1 - Funding Information: This work was supported by Korean Grant (NRF-2017R1A2B4011594, Pioneer Research 2013M3C1A3065522), JSPS KAKENHI Grant (JP15H05870, JP26220711), and Fundamental Research Funds for Central University of China. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/10/10

Y1 - 2018/10/10

N2 - We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAlAs quantum ring can be controlled by excitation intensity. With a weak excitation intensity of 1.2 kW cm-2, the optical Aharonov-Bohm oscillation period of biexcitons was observed to be half that of excitons in accordance with the period expected for a two-exciton Wigner molecule. When the excitation intensity is increased by an order of magnitude (12 kW cm-2), a gradual deviation of the Wigner molecule condition occurs with decreased oscillation periods and diamagnetic coefficients for both excitons and biexcitons along with a spectral shift. These results suggest that the effective orbit radii and rim widths of electrons and holes in a single quantum ring can be modified by light intensity via photoexcited carriers, which are possibly trapped at interface defects resulting in a local electric field.

AB - We found that optical Aharonov-Bohm oscillations in a single GaAs/GaAlAs quantum ring can be controlled by excitation intensity. With a weak excitation intensity of 1.2 kW cm-2, the optical Aharonov-Bohm oscillation period of biexcitons was observed to be half that of excitons in accordance with the period expected for a two-exciton Wigner molecule. When the excitation intensity is increased by an order of magnitude (12 kW cm-2), a gradual deviation of the Wigner molecule condition occurs with decreased oscillation periods and diamagnetic coefficients for both excitons and biexcitons along with a spectral shift. These results suggest that the effective orbit radii and rim widths of electrons and holes in a single quantum ring can be modified by light intensity via photoexcited carriers, which are possibly trapped at interface defects resulting in a local electric field.

KW - Aharonovâ'Bohm effect

KW - Quantum rings

KW - excitons

KW - light excitation

KW - photoluminescence

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JO - Nano Letters

JF - Nano Letters

IS - 10

ER -

Light Controlled Optical Aharonov-Bohm Oscillations in a Single Quantum Ring

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