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Production scientifique
Semi-conducteurs: Graphène, Grand gap & Photovoltaïque
(9) Production(s) de l'année 2019
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Trapping Dipolar Exciton Fluids in GaN/(AlGa)N Nanostructures 
Auteur(s): Chiaruttini F., Guillet T., Brimont C., Jouault B., Lefebvre P., Vives Jessica, Chenot Sebastien, Cordier Yvon, Damilano Benjamin, Vladimirova M.
(Article) Publié:
Nano Letters, vol. 19 p.4911-4918 (2019)
Texte intégral en Openaccess : 
Ref HAL: hal-02272702_v1
Ref Arxiv: 1902.02974
DOI: 10.1021/acs.nanolett.9b00914
WoS: 000481563800013
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
1 Citation
Résumé: Dipolar excitons offer a rich playground for both design of novel optoelectronic devices and fundamental many-body physics. Wide GaN/(AlGa)N quantum wells host a new and promising realization of dipolar excitons. We demonstrate the in-plane confinement and cooling of these excitons, when trapped in the electrostatic potential created by semitransparent electrodes of various shapes deposited on the sample surface. This result is a prerequisite for the electrical control of the exciton densities and fluxes, as well for studies of the complex phase diagram of these dipolar bosons at low temperature.
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Terahertz Spectroscopy of Two-Dimensional Semimetal in Three-Layer InAs/GaSb/InAs Quantum Well
Auteur(s): Krishtopenko S., Ruffenach S., Gonzalez-posada F., Consejo C., Desrat W., Jouault B., Knap W., Fadeev M. a., Kadykov A., Rumyantsev V. V., Morozov S. V., Boissier G., Tournie E., Gavrilenko V. I., Teppe F.
(Article) Publié:
Jetp Letters / Sov Phys Jetp Lett, vol. 109 p.96-101 (2019)
Ref HAL: hal-02157723_v1
DOI: 10.1134/S0021364019020085
WoS: WOS:000467096800005
Exporter : BibTex | endNote
1 Citation
Résumé: The features of terahertz photoluminescence and magnetoabsorption in magnetic fields up to 16 T in threelayer InAs/GaSb/InAs quantum wells with a band structure corresponding to a “two-dimensional semimetal” are studied. The comparison of the positions and amplitudes of the photoluminescence lines with the theoretical calculations of oscillator strengths for interband and intraband transitions performed using the eight-band Kane Hamiltonian indicates the existence of a nonradiative recombination channel associated with the overlap of the conduction and valence bands. The energies of interband and intraband Landau level transitions observed in the magnetoabsorption spectra are in good agreement with theoretical calculations, which confirms the predicted band structure.
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