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Energy States in Graded Cylindrical GaAs/Al x Ga 1—x As Quantum Wires
Author(s) -
de Carvalho R.R.L.,
Farias G.A.,
Freire V.N.
Publication year - 1998
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/(sici)1521-3951(199811)210:1<75::aid-pssb75>3.0.co;2-1
Subject(s) - excited state , radius , electron , x ray absorption spectroscopy , quantum wire , condensed matter physics , quantum well , atomic physics , blueshift , materials science , quantum , gallium arsenide , physics , optoelectronics , optics , photoluminescence , absorption spectroscopy , quantum mechanics , laser , computer security , computer science
The existence of graded interfaces is shown to blue shift the confined electron energy states in cylindrical GaAs/Al x Ga 1— x As quantum wires. The shift strength depends on the wire radius and on the interface width. High excited electron states can be eliminated when the wire interface is thick enough. Numerical calculations performed for a cylindrical GaAs/Al 0.3 Ga 0.7 As quantum wire with radius 40 Å show that the electron ground state energy is blue shifted as much as 16 meV when its interface is only 10 Å wide, and that all excited states are precluded.