Exciton localization and migration in individual CdSe quantum wires at low temperatures

J. J. Glennon; R. Tang; W. E. Buhro; R. A. Loomis; D. A. Bussian; H. Htoon; V. I. Klimov

doi:10.1103/PhysRevB.80.081303

Exciton localization and migration in individual CdSe quantum wires at low temperatures

J. J. Glennon, R. Tang, W. E. Buhro, R. A. Loomis, D. A. Bussian, H. Htoon, V. I. Klimov

Biophotonics Research Center

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

23 Scopus citations

Abstract

Low-temperature (<40 K) photoluminescence (PL) spectra of individual CdSe nanocrystal quantum wires exhibit narrow (<5 meV) isolated peaks spanning a range ≤50 meV. We attribute these features to emission of excitons localized in shallow (a few meV deep) tight potential minima superimposed on longer-scale and larger-amplitude variations of the potential energy. Spectrally resolved PL dynamics reveal decreasing exciton-decay rates with decreasing emission energy. These observations are consistent with exciton relaxation within a manifold of localization sites characterized by an exponential density of states.

Original language	English
Article number	081303
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.80.081303
State	Published - Aug 11 2009

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10.1103/PhysRevB.80.081303

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title = "Exciton localization and migration in individual CdSe quantum wires at low temperatures",

abstract = "Low-temperature (<40 K) photoluminescence (PL) spectra of individual CdSe nanocrystal quantum wires exhibit narrow (<5 meV) isolated peaks spanning a range ≤50 meV. We attribute these features to emission of excitons localized in shallow (a few meV deep) tight potential minima superimposed on longer-scale and larger-amplitude variations of the potential energy. Spectrally resolved PL dynamics reveal decreasing exciton-decay rates with decreasing emission energy. These observations are consistent with exciton relaxation within a manifold of localization sites characterized by an exponential density of states.",

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AU - Glennon, J. J.

AU - Tang, R.

AU - Buhro, W. E.

AU - Loomis, R. A.

AU - Bussian, D. A.

AU - Htoon, H.

AU - Klimov, V. I.

PY - 2009/8/11

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AB - Low-temperature (<40 K) photoluminescence (PL) spectra of individual CdSe nanocrystal quantum wires exhibit narrow (<5 meV) isolated peaks spanning a range ≤50 meV. We attribute these features to emission of excitons localized in shallow (a few meV deep) tight potential minima superimposed on longer-scale and larger-amplitude variations of the potential energy. Spectrally resolved PL dynamics reveal decreasing exciton-decay rates with decreasing emission energy. These observations are consistent with exciton relaxation within a manifold of localization sites characterized by an exponential density of states.

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JO - Physical Review B - Condensed Matter and Materials Physics

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Exciton localization and migration in individual CdSe quantum wires at low temperatures

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