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Are aharonov-bohm effect and quantized hall regime compatible? 
Auteur(s): Chenaud B., Chaubet C., Jouault B., Saminadayar L., Mailly D., Faini G., Cavanna A.
Conference: 11th International Symposium on Nanostructures - Physics and Technology (St Petersburg (RUSSIA), FR, 2003-06-23)
Actes de conférence: International Journal of Nanoscience, Vol 2, No 6, vol. 2 p.535-541 (2003)
Ref HAL: hal-00544479_v1
Exporter : BibTex | endNote
Résumé: We present calculations of the quantum oscillations appearing in the transmission of a mesoscopic GaAs/GaAlAs ring isolated by quantum point contacts. We show that the device acts as an electronic Fabry-Perot spectrometer in the quantum Hall effect regime, and discuss the effect of the coherence length of edge states.
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Inter and intra Landau level scatterings as a mechanism for the onset of the voltage drop across the contact at high currents in the quantum Hall effect regime
Auteur(s): Chaubet C., Meziani Ym, Jouault B., Raymond A., Poirier W., Piquemal F.
(Article) Publié:
Semiconductor Science And Technology, vol. 18 p.983-991 (2003)
Ref HAL: hal-00544453_v1
Exporter : BibTex | endNote
Résumé: In this paper we report on both experimental and theoretical studies of the voltage drop across the source contact in the quantum Hall effect regime at high currents. Our investigations have been performed on the plateau v = 2 using two Hall bars of different widths, processed on the same sample. A steep increase of the voltage drop across the source contact is observed experimentally well before the breakdown of the quantum Hall effect. This behaviour is analysed in the framework of inter and intra Landau level scatterings. The theoretical curves reproduce correctly the main aspects of the experimental data. Our work corroborates the results published recently by the group of Komiyama upon the Landau emission of two-dimensional electron gas.
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Discrete states of conduction electrons bound to magnetoacceptors in quantum wells
Auteur(s): Bonifacie S., Meziani Ym, Juillaguet S., Chaubet C., Raymond A., Zawadzki W., Thierry-Mieg V., Zeman J.
(Article) Publié:
Physical Review B, vol. 68 p.165330 (2003)
Ref HAL: hal-00543765_v1
DOI: 10.1103/PhysRevB.68.165330
WoS: 000186571800061
Exporter : BibTex | endNote
6 Citations
Résumé: Discrete states of conduction electrons bound to ionized acceptors are observed in intraband magneto-optical experiments on Be-doped GaAs/Ga0.67Al0.33As quantum wells. The electrons are bound to acceptors by a joint effect of the quantum well and an external magnetic field. The observed transition energies are successfully described using states of single magnetoacceptors. The energies show evidence for oscillatory screening of acceptor potentials. Also, two disorder modes of the cyclotron resonance related to acceptor potential fluctuations are observed at higher filling factors.
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2DEG spectroscopy with resonant tunneling through single impurity state
Auteur(s): Cryglas M., Baj M., Jouault B., Raymond A., Chaubet C., Chenaud B., Robert J. L., Faini G.
Conference: International Journal of Nanoscience, Vol 2, No 6 (PO BOX 128 FARRER RD, SINGAPORE 9128, SG, 2003-07-24)
Ref HAL: hal-03037692_v1
Exporter : BibTex | endNote
Résumé: We have used silicon impurities in an aluminum arsenide barrier to probe an adjacent two-dimensional electron gas (2DEG). A single impurity acts as a local spectrometer and scans the local density of states of the 2DEG. Magnetotransport experiments have been performed at low temperature with a magnetic field B applied along the direction of the current. Current-voltage characteristics strongly depend on B and reveal the formation of Landau levels (LLs).
Commentaires: 11th International Symposium on Nanostructures - Physics and Technology, St Petersburg, RUSSIA, JUN 23-28, 2003
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Are aharonov-bohm effect and quantized hall regime compatible?
Auteur(s): Chenaud B., Chaubet C., Jouault B., Saminadayar L., Mailly D., Faini G., Cavanna A.
(Article) Publié:
International Journal Of Nanoscience, vol. 2 p.535-541 (2003)
Ref HAL: hal-03037548_v1
DOI: 10.1142/S0219581X03001656
Exporter : BibTex | endNote
Résumé: We present calculations of the quantum oscillations appearing in the transmission of a mesoscopic GaAs/GaAlAs ring isolated by quantum point contacts. We show that the device acts as an electronic Fabry-Perot spectrometer in the quantum Hall effect regime, and discuss the effect of the coherence length of edge states.
Commentaires: 11th International Symposium on Nanostructures - Physics and Technology, St Petersburg, RUSSIA, JUN 23-28, 2003
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