Probing the quantum noise of the spinon Fermi surface with NV centers

We study the transverse electrical conductivity and the corresponding magnetic noise of a two-dimensional U(1) spin liquid state with a spinon Fermi surface. We show that in the quasistatic regime these responses have the same wave-vector dependence as that of a metal but are reduced by a dimensionless prefactor controlled by the ratio of orbital diamagnetic susceptibilities of the spinons and chargons, correcting previous work. We estimate that this quasistatic regime is comfortably accessed by the typical nitrogen vacancy (NV) center splittings of a few gigahertz and estimate that the expected T1 times for an NV center placed above candidate materials, such as organic dmit and ET salts and monolayer 1T-TaS2/Se2, would range from several tens to a few hundred milliseconds.

Automated summary

This study investigates the transverse electrical conductivity and magnetic noise of a two-dimensional U(1) spin liquid state. The results show that in the quasistatic regime, these responses have similar characteristics to that of a metal but are reduced by a factor determined by the ratio of orbital diamagnetic susceptibilities of the spinons and chargons.