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

H. Htoon; D. Kulik; O. Baklenov; T. Takagahara; A. L. Holmes; C. K. Shih

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

H. Htoon, D. Kulik, O. Baklenov, T. Takagahara, A. L. Holmes, C. K. Shih

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

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 (E_rel), we identified two distinct regions of E_rel 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 E_rel range where these phonon emission processes are suppressed due to the reduction of interaction phase space.

Original language	English
Article number	241303
Pages (from-to)	2413031-2413034
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	24
Publication status	Published - 2001 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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title = "Carrier relaxation and quantum decoherence of excited states in self-assembled quantum dots",

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.",

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T1 - Carrier relaxation and quantum decoherence of excited states in self-assembled quantum dots

AU - Htoon, H.

AU - Kulik, D.

AU - Baklenov, O.

AU - Takagahara, T.

AU - Holmes, A. L.

AU - Shih, C. K.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - 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.

AB - 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.

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JF - Physical Review B - Condensed Matter and Materials Physics

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M1 - 241303

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

Abstract

ASJC Scopus subject areas

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