%0 Conference Proceedings
%T Magnetic thaw-down and boil-off due to magneto acceptors in 2DEG
%+ Laboratoire Charles Coulomb (L2C)
%A Chaubet, Christophe
%A Raymond, Andre
%< avec comité de lecture
%Z L2C:12-416
%@ 0094-243X
%J AIP Conference Proceedings
%( THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st Inter. Conf. on the Physics of Semiconductors
%B 31st International Conference on the Physics of Semiconductors
%C Switzerland
%I American Institute of Physics
%V 1566
%P 277
%8 2012-07-29
%D 2012
%R 10.1063/1.4848393
%Z Physics [physics]/Quantum Physics [quant-ph]
%Z Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]Conference papers
%X The Quantum Hall Effect (QHE) and Shubnikov-de Haas effect are investigated experimentally using n type modulation-doped GaAs/GaAlAs quantum wells (QWs) additionally doped in the well with beryllium acceptor atoms. It is presently shown that the localized magneto-acceptor (MA) states which possess discrete energies above the corresponding Landau levels (LLs) lead to two observable effects in magneto-transport: magnetic thaw-down and magnetic boil-off of 2D electrons. Both effects are related to the fact that electrons occupying the localized MA states cannot conduct. Thus in the thaw-down effect the electrons fall down from the MA states to the free Landau states. This leads to a shift of the Hall plateau towards higher magnetic fields as a consequence of an increase of the 2D electron density NS. In the boil-off effect the electrons are pushed from the free Landau states to the empty MA states under high enough Hall electric field. This process has an avalanche character leading to a dramatic increase of magneto-resistance, consequence of a decrease of NS.
%G English
%L hal-00924060
%U https://hal.science/hal-00924060
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021