# Critical drag as a mechanism for resistivity

@article{Else2021CriticalDA, title={Critical drag as a mechanism for resistivity}, author={Dominic V. Else and Todadri Senthil}, journal={Physical Review B}, year={2021} }

A quantum many-body system with a conserved electric charge can have a DC resistivity that is either exactly zero (implying it supports dissipationless current) or nonzero. Exactly zero resistivity is related to conservation laws that prevent the current from degrading. In this paper, we carefully examine the situations in which such a circumstance can occur. We find that exactly zero resistivity requires either continuous translation symmetry, or an internal symmetry that has a certain kind of…

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