Low-frequency conductivity in many-body localized systems

Sarang Gopalakrishnan, Markus Mueller, Vedika Khemani +3

We argue that the a.c. conductivity $\sigma (\omega )$ in the many-body localized phase is a power law of frequency $\omega$ at low frequency: specifically, $\sigma (\omega )\sim {\omega }^{\alpha }$ with the exponent $\alpha$ ap…