Microscopic description of exciton polaritons in direct two-band semiconductors

Nguyen, Van Trong; Mahler, G.

doi:10.1103/physrevb.60.2456

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…In addition to the above considerations, the coherence properties of laser light justify for most purposes a description in terms of classical electric fields. Although this approach is highly successful, it should not be overlooked that in ultrafast semiconductor optics there are also a number of effects that require a full quantized treatment of the laser fields [109,[121][122][123][124][125][126]. These effects are, however, outside the scope of this review.…”

Section: Standard Semiconductor Modelmentioning

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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Section: Standard Semiconductor Modelmentioning

confidence: 99%

“…Missing are, e.g. contributions corresponding to the interband exchange interaction [68,106,108,109]. A measure of the relative strengths of the latter is the splitting energy between longitudinal and transverse excitons compared with the exciton binding energy [106].…”

Section: Standard Semiconductor Modelmentioning

confidence: 99%

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

2004

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“…Since the pioneering work of Hopfield [1], the excitonpolariton propagation in bulk semiconductor and heterostructures has been the subject of constant research with a strong recent revival [2][3][4][5]. Because of electron-hole Coulomb interaction the semiconductor optical response exhibits excitonic resonances, whose polarization exchanges momentum with the propagating electromagnetic field (EMF) resulting in spatially dispersive behavior.…”

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confidence: 99%

Unified Picture of Polariton Propagation in Bulk GaAs Semiconductors

et al. 2000

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High-resolution amplitude and phase linear spectroscopy of high-quality bulk GaAs are reported. The detailed structure of the observed full complex transmission is consistently explained by polariton effects on the basis of microscopic calculations. The coupled equations for the excitonic polarization and the light field in the slab configuration are evaluated using appropriate boundary conditions for the electromagnetic field and the excitonic wave function without reference to additional boundary conditions for the macroscopic polarization.

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Modification of electron-hole excitations for a quantum well embedded in an asymmetric dielectric structure

Nguyen

Mahler

2004

Phys. Rev. B

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Microscopic description of exciton polaritons in direct two-band semiconductors

Cited by 3 publications

References 22 publications

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

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

Unified Picture of Polariton Propagation in Bulk GaAs Semiconductors

Modification of electron-hole excitations for a quantum well embedded in an asymmetric dielectric structure

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