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Two‐dimensional electrons occupying multiple valleys in AlAs
Author(s) -
Shayegan M.,
De Poortere E. P.,
Gunawan O.,
Shkolnikov Y. P.,
Tutuc E.,
Vakili K.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642212
Subject(s) - brillouin zone , electron , anisotropy , condensed matter physics , effective mass (spring–mass system) , physics , maxima and minima , symmetry (geometry) , conduction band , degeneracy (biology) , geometry , optics , quantum mechanics , mathematics , bioinformatics , biology , mathematical analysis
Two‐dimensional electrons in AlAs quantum wells occupy multiple conduction‐band minima at the X‐points of the Brillouin zone. These valleys have large effective mass and g ‐factor compared to the standard GaAs electrons, and are also highly anisotropic. With proper choice of well width and by applying symmetry‐breaking strain in the plane, one can control the occupation of different valleys thus rendering a system with tuneable effective mass, g ‐factor, Fermi contour anisotropy, and valley degeneracy. Here we review some of the rich physics that this system has allowed us to explore. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)