Amperean Pairing Instability in the U(1) Spin Liquid State with Fermi Surface and Application to -(BEDT-TTF)2 Cu2 (CN)3
Abstract
Recent experiments on the organic compound -(BEDT-TTF)2 Cu2 (CN)3 raise the possibility that the system may be described as a quantum spin liquid. Here we propose a pairing state caused by the `Amperean' attractive interaction between spinons on a Fermi surface mediated by the U(1) gauge field. We show that this state can explain many of the observed low temperature phenomena and discuss testable consequences.
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