Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

Ryan W. Crisp; Joel N. Schrauben; Matthew C. Beard; Joseph M. Luther; Justin C. Johnson

doi:10.1021/nl402725m

Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

Ryan W. Crisp, Joel N. Schrauben, Matthew C. Beard, Joseph M. Luther, Justin C. Johnson

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

59 Scopus Citations

Abstract

Quantum dots (QDs) coupled into disordered arrays have exhibited the intriguing property of bulk-like transport while maintaining discrete excitonic optical transitions. We have utilized ultrafast cross-polarized transient grating (CPTG) spectroscopy to measure electron-hole wave function overlap in CdSe QD films with chemically modified surfaces for tuning inter-QD electronic coupling. By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter.

Original language	American English
Pages (from-to)	4862-4869
Number of pages	8
Journal	Nano Letters
Volume	13
Issue number	10
DOIs	https://doi.org/10.1021/nl402725m https://doi.org/10.1021/nl402725m
State	Published - 2013

NREL Publication Number

NREL/JA-5900-60817

Keywords

delocalization
exciton
nonlinear
Quantum dot
spin
ultrafast

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title = "Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays",

abstract = "Quantum dots (QDs) coupled into disordered arrays have exhibited the intriguing property of bulk-like transport while maintaining discrete excitonic optical transitions. We have utilized ultrafast cross-polarized transient grating (CPTG) spectroscopy to measure electron-hole wave function overlap in CdSe QD films with chemically modified surfaces for tuning inter-QD electronic coupling. By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter.",

keywords = "delocalization, exciton, nonlinear, Quantum dot, spin, ultrafast",

author = "Crisp, {Ryan W.} and Schrauben, {Joel N.} and Beard, {Matthew C.} and Luther, {Joseph M.} and Johnson, {Justin C.}",

year = "2013",

doi = "10.1021/nl402725m",

language = "American English",

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pages = "4862--4869",

journal = "Nano Letters",

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publisher = "American Chemical Society",

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T1 - Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

AU - Crisp, Ryan W.

AU - Schrauben, Joel N.

AU - Beard, Matthew C.

AU - Luther, Joseph M.

AU - Johnson, Justin C.

PY - 2013

Y1 - 2013

N2 - Quantum dots (QDs) coupled into disordered arrays have exhibited the intriguing property of bulk-like transport while maintaining discrete excitonic optical transitions. We have utilized ultrafast cross-polarized transient grating (CPTG) spectroscopy to measure electron-hole wave function overlap in CdSe QD films with chemically modified surfaces for tuning inter-QD electronic coupling. By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter.

AB - Quantum dots (QDs) coupled into disordered arrays have exhibited the intriguing property of bulk-like transport while maintaining discrete excitonic optical transitions. We have utilized ultrafast cross-polarized transient grating (CPTG) spectroscopy to measure electron-hole wave function overlap in CdSe QD films with chemically modified surfaces for tuning inter-QD electronic coupling. By comparing the CPTG decays with those of isolated QDs, we find that excitons coherently delocalize to form excited states more than 200% larger than the QD diameter.

KW - delocalization

KW - exciton

KW - nonlinear

KW - Quantum dot

KW - spin

KW - ultrafast

UR - http://www.scopus.com/inward/record.url?scp=84885446540&partnerID=8YFLogxK

U2 - 10.1021/nl402725m

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SP - 4862

EP - 4869

JO - Nano Letters

JF - Nano Letters

IS - 10

ER -

Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

Abstract

NREL Publication Number

Keywords

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