Castner TG. A nearly universal critical conductivity for semiconductor-metal alloys.
PHYSICAL REVIEW LETTERS 2000;
84:2905-2908. [PMID:
11018972 DOI:
10.1103/physrevlett.84.2905]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/1999] [Indexed: 05/23/2023]
Abstract
Classical ionized impurity scattering is employed to calculate the conductivity at and in the vicinity of the critical point. The result sigma(iis)(x = x(c),T) = Asqrt[T], closely given by e(2)/Planck's over 2pilambda(dB) with the de Broglie wavelength lambda(dB) = h/(2m(*)kT)(1/2) in the nondegenerate regime epsilon(F)<<kT, is weakly dependent on the form of the density of states above the mobility edge. This result can explain the sqrt[T] term observed for amorphous semiconductor alloys. sigma(iis)(x>x(c), T) might also explain the linear scaling behavior sigma(x, T)-Asqrt[T] = sigma(0)(x/x(0)-1).
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