Electromagnetic response of the gauge-field model

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We calculated the polarization function of the gauge field model at finite temperature. The effect of the gauge field was considered to the order of (Formula presented) in the convention of a (Formula presented) expansion. We found significant cancellation among Feynman diagrams. As a result, the real part of conductivity has the following behavior: In the low frequency region it is proportional to (Formula presented), similar to that in the Drude model and in the infrared-frequency region there is contribution from an exciting gauge field and particle-hole pair. This makes (Formula presented) decrease much slower than that in the Drude model. Another important consequence of the cancellation is that (Formula presented) in the low-frequency region is temperature sensitive but not so when the frequency approaches the Fermi energy.

Original languageEnglish
Pages (from-to)15402-15410
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number21
StatePublished - 1996


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