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

64 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

NLR Publication Number

NREL/JA-5900-60817

Keywords

delocalization
exciton
nonlinear
Quantum dot
spin
ultrafast

Access to Document

Cite this

@article{7dc2a1fc88c34d0f8ab75386ca5461ef,

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",

volume = "13",

pages = "4862--4869",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "10",

}

TY - JOUR

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 - https://www.scopus.com/pages/publications/84885446540

U2 - 10.1021/nl402725m

DO - 10.1021/nl402725m

M3 - Article

C2 - 24041088

AN - SCOPUS:84885446540

SN - 1530-6984

VL - 13

SP - 4862

EP - 4869

JO - Nano Letters

JF - Nano Letters

IS - 10

ER -

Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays

Abstract

NLR Publication Number

Keywords

Access to Document

Other files and links

Fingerprint

Cite this