Dynamics Near Quantum Criticality in Two Space Dimensions by Snir Gazit

Author:Snir Gazit
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(2.18)

Similarly, in the ordered phase, the dynamical conductivity grows rapidly starting at a threshold frequency , and saturates at high frequency at a value . A calculation to leading order in weak coupling predicts [1, 27] (see also appendix C)

(2.19)

In contrast to the disordered phase, there is a sub-gap component to the conductivity, owing to the gaplessness of the Goldstone mode(s). This feature is first evident at two loop order in a perturbative calculation of the conductivity. This was computed in Ref. [1], where it was found that the corresponding sub-threshold () contribution to is

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