Coherent time-resolved investigation of LO-phonon dynamics in GaAs

Vallée, Fabrice; Bogani, F.

doi:10.1103/physrevb.43.12049

Cited by 138 publications

(88 citation statements)

References 18 publications

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“…It is known in bulk structures that LO phonons disintegrate into two less energetic phonons. 7 The decay frequency has been measured in bulk structures to be ⌫ ph ϭ0.1 ps Ϫ1 at low temperatures and 0.5 ps Ϫ1 at room temperature. 7 The phonon decay has not been measured in QDs but the lifetime of confined LO phonons in QDs has been calculated to be of the same order.…”

Section: ͑3͒mentioning

confidence: 99%

“…This implies that the coupling of bound electrons to LO phonons cannot be treated in the frame of Fermi's golden rule and that the energy relaxation in QDs does not correspond to irreversible onephonon processes. Instead, the finite phonon lifetime, measured in bulk semiconductors to be about 10 ps at low temperatures ͑2 ps at room temperature͒, 7 leads to a relaxation of the polaron. An analogue of such a coupled electron-LO phonon system is a coupled exciton-photon system in a microcavity in which energy is periodically exchanged between exciton and photon modes.…”

Section: Influence Of Quasibound States On the Carrier Capture In Quamentioning

confidence: 99%

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Influence of quasibound states on the carrier capture in quantum dots

Magnúsdóttir

Uskov

Ferreira

et al. 2002

Applied Physics Letters

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Section: ͑3͒mentioning

confidence: 99%

Section: Influence Of Quasibound States On the Carrier Capture In Quamentioning

confidence: 99%

Influence of quasibound states on the carrier capture in quantum dots

Magnúsdóttir

Uskov

Ferreira

et al. 2002

Applied Physics Letters

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“…The driving force in Eqn. (5) and (6) is set-up by a c o m bined action of the electric eld dynamics and the polarization, which has been expressed in the di erent possible contributions in Eqns. (3) and (4).…”

Section: Coherent Phonon Generationmentioning

confidence: 99%

“…Extensive i n vestigation of the phonon dynamics in InP and GaAs have been performedby this technique by V all ee at al. 5,6,7]. For a review on coherent anti-Stokes Raman scattering techniques and results we refer to Bron 8].…”

Section: Introductionmentioning

confidence: 99%

Coherent phonons in condensed media

Dekorsy¹,

Cho²,

Kurz³

2000

Topics in Applied Physics

137

127

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Abstract. The impulsive excitation and phase-sensitive detection of coherent phonons and phonon-polaritons provide a detailed insight i n to the dynamical properties of matter. The experiments are based on optical pump-probe techniques with femtosecond time resolution. These techniques enable the detection of amplitude and phase of the coherent lattice motion simultaneously. F requencies in the THz range and dephasing times in the picosecond range can be obtained with high accuracy. Especially in semiconductors and semiconductor heterostructures, where a coherent phonon mode and free carriers are excited simultaneously, important information about carrier-phonon interaction far away from equilibrium is obtained. This paper presents an overview of recent a c hievements in this vivid eld of condensed matter physics.

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“…Without including anharmonic effects, these oscillations would decay very slowly due to the weak LO phonon dispersion. When the anharmonic phonon damping (corresponding to τ LO = 9 ps decay of an LO phonon [36,37]) is included by substituting ω o,k → ω o,k ± iγ LO , the LO phonon beats decay with characteristic time slightly below τ LO , which results from the joint effect of damping and dispersion. The long-time dynamics is governed by the Lorentzian feature around ω = E 0 and shows an exponential decay (as assumed beforehand).…”

mentioning

confidence: 99%

Fast Control of Quantum States in Quantum Dots: Limits due to Decoherence

Jacak

Machnikowski

Krasnyj

Quantum Dots: Fundamentals, Applications, and Frontiers

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We study the kinetics of confined carrier-phonon system in a quantum dot under fast optical driving and discuss the resulting limitations to fast coherent control over the quantum state in such systems. IntroductionUnlike natural atoms, semiconductor quantum dots (QDs) always form part of a macroscopic crystal. The interaction with the quasicontinuum of lattice degrees of freedom (phonons) constitutes an inherent feature of these nanometer-size systems and cannot be neglected in any realistic modeling of QD properties, especially when the coherence of confined carriers is of importance. The understanding of the decisive role played by the QD coupling to lattice modes has increased recently due to both experimental and theoretical study (spectrum reconstruction [1-4], relaxation [5][6][7][8][9][10], phonon replicas and phonon-assisted transitions [11][12][13][14][15][16], phonon-induced pure dephasing upon ultrafast excitation [17][18][19][20][21][22]). The phonon-induced decoherence seems to be crucial for any quantum information processing application and for any nanotechnological device relying on quantum coherence of confined carriers [23,24].There are three major mechanisms of carrier-phonon interaction [25]: (1) Coulomb interaction with the lattice polarization induced by the relative shift of the positive and negative sub-lattices of the polar compound, * On leave from Odessa University, Ukraine

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Coherent time-resolved investigation of LO-phonon dynamics in GaAs

Cited by 138 publications

References 18 publications

Influence of quasibound states on the carrier capture in quantum dots

Influence of quasibound states on the carrier capture in quantum dots

Coherent phonons in condensed media

Fast Control of Quantum States in Quantum Dots: Limits due to Decoherence

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