Exciton-phonon interactions and exciton dephasing in semiconductor quantum-well heterostructures

Bondarev, I. V.; Maksimenko, S. A.; Slepyan, G. Ya.; Krestnikov, I. L.; Hoffmann, A.

doi:10.1103/physrevb.68.073310

Cited by 30 publications

(22 citation statements)

References 11 publications

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“…Since off-diagonal level coupling is absent, the ZPL remains unbroadened. Within this model, different exciton-phonon couplings such as optical polar, acoustic piezoelectric, and deformation potential have been studied 10 . This model was recently extended to include off-diagonal coupling, successfully explaining why the ZPL get broadened even if real phonon-assisted transitions to other levels are not possible (pure dephasing) 11,12 .…”

Section: Introductionmentioning

confidence: 99%

Near-field spectra of quantum well excitons with non-Markovian phonon scattering

Mannarini

Zimmermann

2006

Phys. Rev. B

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The excitonic absorption spectrum for a disordered quantum well in presence of exciton-acoustic phonon interaction is treated beyond the Markov approximation. Realistic disorder exciton states are taken from a microscopic simulation, and the deformation potential interaction is implemented. The exciton Green's function is solved with a self energy in second order Born approximation. The calculated spectra differ from a superposition of Lorentzian lineshapes by enhanced inter-peak absorption. This is a manifestation of pure dephasing which should be possible to measure in near-field experiments.

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Section: Introductionmentioning

confidence: 99%

Near-field spectra of quantum well excitons with non-Markovian phonon scattering

Mannarini

Zimmermann

2006

Phys. Rev. B

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“…The calculations show, [12] that the radiative decay essentially contribute only in the vicinity of the interband transition frequencies. Thus nonradiative channel of the atomic decay can serve as a means for the excitation of surface waves in CNTs, i.e., as a means for the excitation of the CNT-based nanowaveguide.…”

Section: Discussion: Surface Electromagnetic Waves In Cntmentioning

confidence: 95%

“…As a result, the spontaneous decay probability turns out to be influenced by the nearby located dielectric bodies. Referring to [12,13] for details, we state here that the spontaneous decay rate of an atom in a vicinity of a CNT is larger by a few orders of magnitude than that of the same atom in a free space. Speaking classical electrodynamics language, one can conclude that CNT has very high Q-factor.…”

Section: Discussion: Surface Electromagnetic Waves In Cntmentioning

confidence: 99%

“…Then we will review a number of effects coupled with electromagnetic waves propagation in CNT, giving opportunity to use CNT as a surface wave waveguide in IR frequency range, [2] a monomolecular optical nanoantenna, [11] a nanoantenna excitation device based on the Purcell effect. [12,13] We will pay more attention to review the problem of generation of stimulated emission in nanotube based on the Cherenkov and undulator radiation mechanisms. CNT potential as different types of light emitters (TWT, BWO and nano free electron laser (FEL)) is demonstrated and their possible applications are proposed.…”

Section: Introductionmentioning

confidence: 99%

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Generation and Propagation of Electromagnetic Waves in Carbon Nanotubes: New Propositon for Optoelectronics and Bio‐medical Applications

Kuzhir

Батраков

Maksimenko

2007

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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Electromagnetic response properties of carbon nanotubes (CNTs) are discussed. A basic approach to the problem is proposed synthesizing present-day solid-state physics and classical electrodynamics of nonhomogeneous mediums. [1] The developed theoretical model predicts the property of CNTs to be a strong slowing-down system for surface waves [1,2] and allows proposing the physical schemes of the carbon nanotube use as monomolecular optoelectronic devices, such as a surface wave waveguide in IR frequency range, a monomolecular optical nanoantenna, a nanoantenna excitation device based on the Purcell effect, etc. A particular emphasis is given to the stimulated emission of electromagnetic waves by electron beam in nanotube. The significant retardation of the surface wave along with the ballistic character of the electron motion in nanotubes are shown [3] to be underlying the idea of the monomolecular light emitter with the Cherenkov lasing mechanism: the electrons in nanotube imposed to a realistic voltage can be accelerated to the velocities synchronous with the phase velocity of the surface wave. Since the achievable current density in nanotubes exceeds drastically corresponding characteristic values in vacuum electronic devices, the stimulated emission in CNTs is started at a very small, of the order of several microns, length of electron-photon interaction. A dispersion equation for the electron beam instability in a nanotube is presented and analyzed. The potential of carbon nanotube as traveling wave tube (TWT) and backward wave oscillator (BWO) is demonstrated.

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“…It has in our case a value of F = 0.025, which is in the range of literature values. 8,12,17 This suggests, that the calculated coupling element of g 2 ef f = 3.3 · 10 −5 (eV) 2 are in the correct order of magnitude. 1 In Fig.…”

Section: Diagonal Coupling: Independent Boson Modelmentioning

confidence: 87%

Theory of phonon-assisted intraband transitions in semiconductor quantum dots

et al. 2012

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The investigation of the intersubband dynamics occurring in the conduction band of doped semiconductor quantum dots (QD's) has emerged as a powerful tool to probe their electronic structure and properties. Here, the temperature, the dephasing and the relaxation dynamics are of interest, both from a fundamental point of view but also regarding the performance of QD-based optoelectronic devices. Whereas the lineshape of QD interband transitions is well described by the independent boson model treating a diagonal electron-phonon coupling. For intraband transitions both diagonal and non-diagonal electron-phonon coupling are relevant. Typically, such problems involving diagonal and non-diagonal coupling are treated within approximate or perturbative approaches. Here, we present a fully quantized theory to calculate the coupled electron-phonon dynamics based on a non-perturbative equation of motion approach reproducing also correct results for limits of known exactly solvable models.

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Exciton-phonon interactions and exciton dephasing in semiconductor quantum-well heterostructures

Cited by 30 publications

References 11 publications

Near-field spectra of quantum well excitons with non-Markovian phonon scattering

Near-field spectra of quantum well excitons with non-Markovian phonon scattering

Generation and Propagation of Electromagnetic Waves in Carbon Nanotubes: New Propositon for Optoelectronics and Bio‐medical Applications

Theory of phonon-assisted intraband transitions in semiconductor quantum dots

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