Maissam Barkeshli, Hong Yao, Steven A. Kivelson
For certain crystalline systems, most notably the organic compound EtMe$_3$Sb[Pd(dmit)$_2$]$_2$, experimental evidence has accumulated of an insulating state with a high density of gapless neutral excitations that produce Fermi-liquid-like power laws in thermodynamic quantities and thermal transport. This has been taken as evidence of a fractionalized spin liquid state. In this paper, we argue that if the experiments are taken at face value, the most promising spin liquid candidate is a $Z_2$ spin-liquid with a pseudo-Fermi surface and spontaneously broken time-reversal and inversion symmetry, or spontaneously broken translation symmetry, or a $Z_4$ spin liquid with a pseudo-Fermi surface and no broken symmetries. We present a solvable model on the triangular lattice of the first of these and we find consistency of all these states with magneto-thermal transport measurements.
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http://arxiv.org/abs/1208.3869
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