Theory of quasiequilibrium nonlinear optical absorption in semiconductor superlattices

Je, Koo–Chul; Meier, Torsten; Rossi, Fausto; Koch, S. W.

doi:10.1063/1.114831

Cited by 15 publications

(6 citation statements)

References 11 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, we will review recent simulated experiments of the ultrafast carrier dynamics in semiconductor superlattices [109][110][111][112][113][114] . They are based on a generalized Monte Carlo solution [66][67][68][69][70] of the set of kinetic equations (so-called semiconductor Bloch equations) derived in section II B.…”

Section: A Two Equivalent Picturesmentioning

confidence: 99%

Coherent phenomena in semiconductors

Rossi

1998

Semicond. Sci. Technol.

View full text Add to dashboard Cite

A review of coherent phenomena in photoexcited semiconductors is presented. In particular, two classes of phenomena are considered: On the one hand the role played by optically-induced phase coherence in the ultrafast spectroscopy of semiconductors; On the other hand the Coulomb-induced effects on the coherent optical response of low-dimensional structures.All the phenomena discussed in the paper are analyzed in terms of a theoretical framework based on the density-matrix formalism. Due to its generality, this quantumkinetic approach allows a realistic description of coherent as well as incoherent, i.e. phase-breaking, processes, thus providing quantitative information on the coupledcoherent vs. incoherent-carrier dynamics in photoexcited semiconductors.The primary goal of the paper is to discuss the concept of quantum-mechanical phase coherence as well as its relevance and implications on semiconductor physics and technology. In particular, we will discuss the dominant role played by optically induced phase coherence on the process of carrier photogeneration and relaxation in bulk systems. We will then review typical field-induced coherent phenomena in semiconductor superlattices such as Bloch oscillations and Wannier-Stark localization. Finally, we will discuss the dominant role played by Coulomb correlation on the linear and non-linear optical spectra of realistic quantum-wire structures.

show abstract

Section: A Two Equivalent Picturesmentioning

confidence: 99%

Coherent phenomena in semiconductors

Rossi

1998

Semicond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…As described previously (Pei and Farrar, 2012), the experiment is conducted with a crossed beam instrument employing velocity map product imaging (VMI) detection (Eppink and Parker, 1997). The imaging system determines all product velocities for a given mass in a single detection time window, yielding significant enhancement of detection efficiency through the intrinsic multiplex advantage of the method.…”

Section: Methodsmentioning

confidence: 99%

“…The lower, repeller electrode and the upper, extractor electrode are held at ground potential as the ion and neutral beams intersect. Product detection is achieved by velocity map imaging (Eppink and Parker, 1997) with the two-electrode geometry described by the Suits research group (Townsend et al, 2003). Product detection is initiated by pulsed electric fields applied to the collision volume after reaction has taken place.…”

Section: Methodsmentioning

confidence: 99%

A Velocity Map Imaging Study of the Reactions of O+ (4S) With CH4

Farrar

2019

Front. Chem.

View full text Add to dashboard Cite

We present a velocity map imaging study of the key ion-molecule reactions occurring in the O + ( 4 S 3/2 ) + CH 4 ( X 1 A 1 ) system at collision energies of 1.84 and 2.14 eV. In addition to charge transfer to form CH ( X 2 B 2 ), we also present data on formation of CH ( X 1 A 1 '), for which the experimentally determined images provide clear confirmation that the products arise from dissociative charge transfer rather than hydride transfer. Experimental data are also presented on the formation of HCO + through a transient [OCH 4 ] + complex living many rotational periods. Plausible reaction pathways and intermediate structures are presented to give insight into the routes for formation of these reaction products.

show abstract

“…the solution corresponding to a ␦-like laser excitation E 0 (t) ϰ␦(t). The above polarization equation can be solved in two different ways: ͑i͒ Within the so called dynamical approach, 15,17,18 the full time evolution of the polarization is obtained by means of a time-step solution of Eq. ͑17͒; ͑ii͒ The second approach consists in finding the stationary solutions of Eq.…”

Section: Quasiequilibrium Optical Absorptionmentioning

confidence: 99%

Linear and nonlinear optical properties of realistic quantum-wire structures: The dominant role of Coulomb correlation

Rossi

Molinari

1996

Phys. Rev. B

View full text Add to dashboard Cite

A systematic analysis of the linear and nonlinear optical properties of realistic quantum wires is presented. The proposed theoretical approach, based on a set of generalized semiconductor Bloch equations, provides a full three-dimensional multisubband description of carrier-carrier correlation for any profile of the confinement potential, thus allowing a direct comparison with experiments on available structures. In agreement with previous investigations based on simplified one-dimensional models, our analysis shows that, also for realistic quantum-wire structures, electron-hole Coulomb correlation completely removes the one-dimensional bandedge singularities from the linear-absorption spectra. Moreover, we find that this effect is present also at high densities ͑corresponding to gain regimes͒ and contributes significantly in suppressing the ideal sharp features of the free-carrier density of states. The multisubband nature of available state-of-the-art structures is found to play a dominant role in determining the overall spectral shape in the whole density range.

show abstract

Theory of quasiequilibrium nonlinear optical absorption in semiconductor superlattices

Cited by 15 publications

References 11 publications

Coherent phenomena in semiconductors

Coherent phenomena in semiconductors

A Velocity Map Imaging Study of the Reactions of O+ (4S) With CH4

Linear and nonlinear optical properties of realistic quantum-wire structures: The dominant role of Coulomb correlation

Contact Info

Product

Resources

About