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

研究成果: Article › 査読

抄録

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.

本文言語	English
論文番号	241303
ページ（範囲）	2413031-2413034
ページ数	4
ジャーナル	Physical Review B - Condensed Matter and Materials Physics
巻	63
号	24
出版ステータス	Published - 2001 1月 1
外部発表	はい

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
凝縮系物理学

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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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JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

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

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