Influence of carrier–carrier scattering on intraband dephasing

Wolter, Franz-Erich; Martini, Rainer; Tolk, S.; Bolívar, P. Haring; Kurz, H.; Hey, R.; Grahn, H. T.

doi:10.1006/spmi.1999.0763

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…Specifically, interface roughness scattering 27 has been identified as a dominant mechanism for dephasing in GaAs/ AlGaAs superlattices over a wide temperature range; competitive dephasing mechanisms have been reported due to LO-phonon emission in a miniband wider than the LO-phonon energy ͑36 meV for GaAs-based superlattices͒, and also from carrier-carrier scattering effects. 25,26 In all cases, the estimated linewidth for broadening from such effects ranges as ϳ͑1.25-2.5͒ meV, which corresponds to dephasing times in a range of ϳ͑1.0-0.5͒ ps; [25][26][27] this broadening in energy is nontrivial as it corresponds to about 20% of the Bloch frequency.…”

Section: Summary and Discussionmentioning

confidence: 90%

“…IV. But in recent years, many studies on coherent Bloch oscillations have pointed to the importance of additional scattering effects such as carrier-carrier scattering, 25 LO-phonon scattering, 26 and alloy disorder ͑interface roughness͒ scattering 27 due to superlattice compositional doping, all effects that strongly influence the dephasing of coherent Bloch oscillations, and therefore have a significant influence on the magnitude of the spontaneous emission output. The dephasing effects result in a broadening of the peaks of the spontaneous emission probability function that determines the selection rule for transitions, in our case q = m B , and also dampen the output THz radiation amplitude.…”

Section: Summary and Discussionmentioning

confidence: 99%

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Spontaneous emission of Bloch oscillation radiation from a single energy band

et al. 2006

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In this study, we explored the possibility of enhanced spontaneous emission of radiation beyond the free space value by analyzing a semiconductor superlattice structure placed in a microcavity whose resonant modes were tuned to the Bloch frequency. In particular, we considered the spontaneous emission of Bloch radiation into the dominant mode of a rectangular waveguide. In the REPORT DOCUMENTATION PAGE Form Approved OMB NO. 0704-0188 Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports,

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Section: Summary and Discussionmentioning

confidence: 90%

Section: Summary and Discussionmentioning

confidence: 99%

Spontaneous emission of Bloch oscillation radiation from a single energy band

et al. 2006

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“…It turns out, however, that the width of the miniband compared with typical phonon energies has a profound influence on the relaxation properties as well as the excitation conditions. At high excitation densities, BOs are strongly affected by Coulomb scattering [329,330]. Interestingly, the scattering of coherently generated carriers is found to differ significantly from the scattering with an incoherent background of carriers [329].…”

Section: Bloch Oscillationsmentioning

confidence: 94%

“…At high excitation densities, BOs are strongly affected by Coulomb scattering [329,330]. Interestingly, the scattering of coherently generated carriers is found to differ significantly from the scattering with an incoherent background of carriers [329]. In fact, terahertz emission measurements from optically excited BOs indicate that the intraband dephasing resulting from scattering with incoherent carrier densities is twice as efficient as in the case of coherent densities [329].…”

Section: Bloch Oscillationsmentioning

confidence: 96%

“…With rising field strength, superlattices exhibit a continuous transformation from the Franz-Keldysh to the Wannier-Stark regime, thus enabling a coexistence of both effects at intermediate fields [321][322][323][324][325]. Another focus of interest has been the relaxation of BOs [301,[326][327][328][329][330][331]. For low excitation densities, the relaxation is found to be mainly due to phonon [326,327] and interface roughness [328] scattering.…”

Section: Bloch Oscillationsmentioning

confidence: 99%

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Femtosecond spectroscopy in semiconductors: a key to coherences, correlations and quantum kinetics

2004

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The application of femtosecond spectroscopy to the study of ultrafast dynamics in semiconductor materials and nanostructures is reviewed with particular emphasis on the physics that can be learned from it. Excitation with ultrashort optical pulses in general results in the creation of coherent superpositions and correlated many-particle states. The review comprises a discussion of the dynamics of this correlated many-body system during and after pulsed excitation as well as its analysis by means of refined measurements and advanced theories. After an introduction of basic concepts-such as coherence, correlation and quantum kinetics-a brief overview of the most important experimental techniques and theoretical approaches is given. The remainder of this paper is devoted to specific results selected in order to highlight how femtosecond spectroscopy gives access to the physics of coherences, correlations and quantum kinetics involving charge, spin and lattice degrees of freedom.First examples deal with the dynamics of basic laser-induced coherences that can be observed, e.g. in quantum beat spectroscopy, in coherent control measurements or in experiments using few-cycle pulses. The phenomena discussed here are basic in the sense that they can be understood to a large extent on the mean-field level of the theory. Nevertheless, already on this level it is found that semiconductors behave substantially differently from atomic systems. Subsequent sections report on the occurrence of coherences and correlations beyond the mean-field level that are mediated either by carrier-phonon or carrier-carrier interactions. The corresponding analysis gives deep insight into fundamental issues such as the energy-time uncertainty, pure dephasing in quantum dot structures, the role of twopair or even higher correlations and the build-up of screening. Finally results are presented concerning the ultrafast dynamics of resonantly coupled excitations, where a combination of different interaction mechanisms is involved in forming new types of correlations. Examples are coupled plasmon-phonon and Bloch-phonon oscillations.The results reviewed in this paper clearly reveal the central role of many-particle correlations and coherences for the ultrafast dynamics of dense semiconductor systems. Both

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TERAHERTZ TECHNOLOGY | Terahertz Physics of Semiconductor Heterostructures

Bratschitsch

Unterrainer

2005

Encyclopedia of Modern Optics

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Influence of carrier–carrier scattering on intraband dephasing

Cited by 6 publications

References 20 publications

Spontaneous emission of Bloch oscillation radiation from a single energy band

Spontaneous emission of Bloch oscillation radiation from a single energy band

Femtosecond spectroscopy in semiconductors: a key to coherences, correlations and quantum kinetics

TERAHERTZ TECHNOLOGY | Terahertz Physics of Semiconductor Heterostructures

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