Carrier relaxation and quantum decoherence of excited states in self-assembled quantum dots

H. Htoon, D. Kulik, O. Baklenov, Toshihide Takagahara, T. Takagahara, C. K. Shih

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Abstract

We report systematic measurements of photoluminescence excitation spectra and dephasing times (T2's) on various excited states of hundreds of individual quantum dots (QDs). From the variation of T2's with the energy separation between excited states and the ground state (Erel), we identified two distinct regions of Erel where LO phonon emission and hole relaxation via LA phonon emission play as dominat dephasing mechanisms. We also found a clear evidence of significantly slow energy relaxation in the Erel range where these phonon emission processes are suppressed due to the reduction of interaction phase space.

Original languageEnglish
Article number241303
Pages (from-to)2413031-2413034
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number24
Publication statusPublished - 2001
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Htoon, H., Kulik, D., Baklenov, O., Takagahara, T., Takagahara, T., & Shih, C. K. (2001). Carrier relaxation and quantum decoherence of excited states in self-assembled quantum dots. Physical Review B - Condensed Matter and Materials Physics, 63(24), 2413031-2413034. [241303].