IMPURITY BAND IN DILUTE MIXED MOLECULAR CRYSTALS

K. WANACHOTE and I.M. TANG

ABSTRACT: The monomer self energy in dilute mixed molecular crystals is obtained by considering a set of diagrams which when summed yields a self energy expression in the form of a continued fraction. Using some theorem concerning Sturm sequences, the analytic behavior of the exciton propagator is obtained. The bandwidth of the impurity band in dilute C₁₀D₀/C₁₀H₈ mixed naphthalene crystals is determined by examining the branch cut appearing in the exciton propagator.

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a. Department of Physics, Faculty of Sciences, King Mongkut Institute of Technology, Thonburi, Thailand.
b. Department of Physics, Faculty of Sciences, Mahidol University, Bangkok, Thailand.

Received 8 April 1983