Accueil >
Production scientifique
|
|
Polariton-polariton interaction constants in microcavities 
Auteur(s): Vladimirova M., Cronenberger S., Scalbert D., Kavokin K., Miard Audrey, Lemaître Aristide, Bloch Jacqueline, Solnyshkov D.D., Malpuech Guillaume, Kavokin A.
(Article) Publié:
Physical Review B, vol. 82 p.075301 (2010)
|
|
|
|
Collective nature of two-dimensional electron gas spin excitations revealed by exchange interaction with magnetic ions
Auteur(s): Barate P., Cronenberger S., Vladimirova M., Scalbert D., Perez Florent, Gomez J., Jusserand Bernard, Boukari Hervé, Ferrand David, Mariette H., Cibert Joel, Nawrocki Michal
(Article) Publié:
Physical Review B, vol. 82 p.075306 (2010)
|
|
|
|
Polarization controlled nonlinear transmission of light through semiconductor microcavities
Auteur(s): Vladimirova M., Cronenberger S., Scalbert D., Nawrocki M., Kavokin A., Miard Audrey, Lemaître Aristide, Bloch Jacqueline
(Article) Publié:
Physical Review B, vol. 79 p.115325 (2009)
Ref HAL: hal-00440481_v1
DOI: 10.1103/PhysRevB.79.115325
WoS: 000264768900107
Exporter : BibTex | endNote
21 Citations
Résumé: We report on a pronounced nonlinear optical effect in a GaAs microcavity operating in the strong-coupling regime: cavity transmission in circular polarization is found to be much stronger than in linear polarization. This behavior has its origin in the spin-dependent repulsive interaction between exciton polaritons. Quantitative analysis allows estimating the strength of interaction between polaritons with parallel spins. The observed effect shows the potentiality of microcavities for circular polarization sensing essential for transmission of polarization encoded signals.
|
|
|
|
Exciton-spin dephasing and relaxation due to symmetry breaking in two-band bulk semiconductors
Auteur(s): Gallart M., Cronenberger S., Brimont C., Honerlage B., Gilliot P.
(Article) Publié:
Physical Review B, vol. 77 p.155212 (2008)
Ref HAL: hal-00545180_v1
DOI: 10.1103/PhysRevB.77.155212
WoS: 000255457400068
Exporter : BibTex | endNote
Résumé: The full point group symmetry of a crystal can be broken due to internal or external effective fields. In the study of excitons, such symmetry breaking can lead to a coupling of different exciton states and if a system is prepared in an exciton state with a defined total angular momentum (pseudospin), spin beating is obtained. Looking at the fluctuations of these fields, we use the invariant expansion of an effective Hamiltonian to investigate exciton-spin-relaxation dynamics in a model two-band bulk semiconductor and discuss the respective importance of the different spin-flip processes. We find that interaction terms leading to an electron or hole spin flip give rise to a pure transverse dephasing. Terms where the electron and hole spins are simultaneously reversed lead to transitions between the spin states, which are characterized by the longitudinal relaxation time. Similar to motional narrowing in the case of free carriers, the latter process can lead to an increase in the exciton-spin-relaxation times if extrinsic electric, magnetic, or strain fields rapidly fluctuate in the sample. This effect is shown to be due to the electron-hole exchange interaction.
|
|
|
|
Relaxation of electron-hole pairs by coherent emission of LO-phonons in the quantum kinetic regime measured in CdZnTe quantum wells
Auteur(s): Cronenberger S., Brimont C., Cregut O., Kheng K., Mariette H., Gallart M., Honerlage B., Gilliot P.
(Article) Publié:
Physical Review B, vol. 77 p.195311 (2008)
Ref HAL: hal-00540834_v1
DOI: 10.1103/PhysRevB.77.195311
WoS: 000256971600090
Exporter : BibTex | endNote
4 Citations
Résumé: We study the relaxation of excitons in CdZnTe quantum wells by emission of a LO-phonon cascade, ending with a trapping-in quantum dots. The state filling of the dots is measured in two-color pump-probe experiments. The observed optical-phonon emission time is found to be smaller (130 fs) than the phonon oscillation period (165 fs), showing that the interaction occurs in a quantum kinetic regime. This is evidenced by measuring the buildup of the phonon replica of an initially photocreated electron-hole pair distribution on a subpicosecond time scale.
|
|
|
|
Dynamics of the localized spins interacting with two-dimensional electron gas: Coexistence of mixed and pure modes
Auteur(s): Vladimirova M., Cronenberger S., Barate P., Scalbert D., Teran F. J., Dmitriev A. P.
(Article) Publié:
Physical Review B, vol. 78 p.081305 (2008)
Ref HAL: hal-00440483_v1
DOI: 10.1103/PhysRevB.78.081305
WoS: 000259406900006
Exporter : BibTex | endNote
22 Citations
Résumé: Time-resolved Kerr rotation experiments show that two kinds of spin modes exist in diluted magnetic semiconductor quantum wells: (i) strongly coupled electron-magnetic ion spin excitations and (ii) excitations of magnetic ion spin subsystem decoupled from electron spins. The coexistence of these two kinds of spin precession modes cannot be understood in terms of average spins but requires a description, which goes beyond the mean-field approximation.
|
|
|
|
Electron spin relaxation in very diluted CdMnTe quantum wells
Auteur(s): Cronenberger S., Barate P., Brunetti Adalberto, Vladimirova M., Scalbert D., Teran Francisco, Karzewski Gregorz, Wojtowicz Tomasz
Conference: 7th International Conference on Physics of light-Matter Coupling in Nanostructures (La Havane, CU, 2007-04-12)
Actes de conférence: Superlattices and Microstructures, vol. 43 p.427 (2008)
|
