1986
DOI: 10.1002/pssb.2221350121
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Anomalous composition dependence of the dielectric constant in bismuth‐antimony alloys due to disorder‐induced indirect interband polarization processes

Abstract: The strong increase of the dielectric constant observed at a critical antimony concentration in semiconducting bismuth-antimony alloys is interpreted in terms of a purely electronic interband polarization enhanced by vanishing of the thermal energy gap. The dominant indirect transitions between conduction and valence band states near the L-and T-points of the Brillouin zone are considered as induced by the short-range scattering potential due to the chemical disorder of the alloy. Reasonable system parameters … Show more

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