Electromagnetic response of the gauge-field model
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
54
Journal Issue
21
Pages
15402-15410
Date Issued
1996
Author(s)
Abstract
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. © 1996 The American Physical Society.
SDGs
Type
journal article