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Effect of ordering on the energy spectrum of narrow-gap III-V alloys:
Possibility of the transition into the gapless state
M.E. Raikh and E.V. Tsiper
Department of Physics, University of Utah, Salt Lake City, Utah 84112
The energy spectrum of a narrow-gap ordered alloy is calculated using
the three-band Kane model. It is shown that when the energy gap,
reduced by ordering, becomes negative, the transition to a gapless,
rather than a semimetallic, state occurs. In order to study the
effects beyond the Kane model, the exact equation for the energy
spectrum including the finite hole mass and the band warp is derived.
The stability of a gapless state with respect to these higher-band
corrections is demonstrated.
Phys. Rev. B50, 14942 (1994)
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