Exciton versus Interband Absorption in Peierls Insulators

概要

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The effect of long-range Coulomb interaction between an electron and a hole on theoptical absorption spectrum of a one-dimensional Peierls insulator is studiedtheoretically. Energy levels and oscillator strengths of exciton states in the Peierls gapand the line shape of the continuous spectrum (interband transitions) above the gapare calculated by taking the interatomic nature of the optical transition matrix ele-ment into account. The effect turns out to be of great significance, in the sense thateven a very weak interaction induces an anomalously large oscillator strength of thelowest exciton (n=0) state.
社団法人日本物理学会の論文
1989-01-15