Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots

Hailin Wang, Xudong Fan, Toshihide Takagahara, J. E. Cunningham

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Using three-pulse transient four-wave mixing (FWM), exciton dephasing in quantum dot-like islands in narrow GaAs quantum wells (QW) was compared with population decay rates. Results reveal a pure dephasing process which dominates excitonic dephasing at elevated temperatures but does not involve exciton population relaxation. The pure dephasing process arises from a mixing of excitonic states with a continuum of acoustic phonons and is enhanced by three-dimensional quantum confinement. The magnitude and temperature dependence of the pure dephasing rate is described by a theoretical model which generalizes the Huang-Rhys theory of F centers to include off-diagonal exciton-phonon coupling.

Original languageEnglish
Title of host publicationTechnical Digest - European Quantum Electronics Conference
Editors Anon
PublisherIEEE
Pages162-163
Number of pages2
Publication statusPublished - 1998
Externally publishedYes
EventProceedings of the 1998 International Quantum Electronics Conference - San Francisco, CA, USA
Duration: 1998 May 31998 May 8

Other

OtherProceedings of the 1998 International Quantum Electronics Conference
CitySan Francisco, CA, USA
Period98/5/398/5/8

Fingerprint

quantum dots
excitons
interactions
color centers
four-wave mixing
decay rates
phonons
quantum wells
continuums
temperature dependence
acoustics
pulses
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Wang, H., Fan, X., Takagahara, T., & Cunningham, J. E. (1998). Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots. In Anon (Ed.), Technical Digest - European Quantum Electronics Conference (pp. 162-163). IEEE.

Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots. / Wang, Hailin; Fan, Xudong; Takagahara, Toshihide; Cunningham, J. E.

Technical Digest - European Quantum Electronics Conference. ed. / Anon. IEEE, 1998. p. 162-163.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wang, H, Fan, X, Takagahara, T & Cunningham, JE 1998, Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots. in Anon (ed.), Technical Digest - European Quantum Electronics Conference. IEEE, pp. 162-163, Proceedings of the 1998 International Quantum Electronics Conference, San Francisco, CA, USA, 98/5/3.
Wang H, Fan X, Takagahara T, Cunningham JE. Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots. In Anon, editor, Technical Digest - European Quantum Electronics Conference. IEEE. 1998. p. 162-163
Wang, Hailin ; Fan, Xudong ; Takagahara, Toshihide ; Cunningham, J. E. / Pure dephasing induced by exciton-phonon interactions in GaAs quantum dots. Technical Digest - European Quantum Electronics Conference. editor / Anon. IEEE, 1998. pp. 162-163
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