Compositional evolution of Bi-induced acceptor states in GaAs1−xBixalloy
Physical Review B2011Vol. 83(20)
Citations Over TimeTop 10% of 2011 papers
Giorgio Pettinari, Hans Engelkamp, P. C. M. Christianen, J. C. Maan, A. Polimeni, M. Capizzi, X. Lu, T. Tiedje
Abstract
Far-infrared absorption measurements have been performed in nominally undoped ${\mathrm{GaAs}}_{1\ensuremath{-}x}{\mathrm{Bi}}_{x}$ (0.6% \ensuremath{\leqslant} $x$ \ensuremath{\leqslant} 10.6%) for magnetic field up to 30 T. For 0.6% \ensuremath{\leqslant} $x$ \ensuremath{\leqslant} 4.5%, the Lyman series of an acceptor has been observed. An exceedingly high value of the ground-state $g$ factor provides strong evidence of Bi-related acceptor states. For $x$ \ensuremath{\geqslant} 5.6%, however, these acceptors suddenly disappear. Such anomalous dependence on Bi concentration parallels those recently reported in ${\mathrm{GaAs}}_{1\ensuremath{-}x}{\mathrm{Bi}}_{x}$ for other electronic and structural properties.
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