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Three decades ago Ioffe and Larkin pointed out a generic mechanism for theformation of a gapped spin liquid. In the case when a classical two-dimensional(2D) frustrated Heisenberg magnet undergoes a Lifshitz transition between acollinear N\'eel phase and a spin spiral phase, quantum effects usually lead tothe development of a spin-liquid phase sandwiched between the N\'eel and spinspiral phases. In the present work, using field theory techniques, we studyproperties of this universal spin liquid phase. We examine the phase diagramnear the Lifshitz point and calculate the positions of critical points,excitation spectra, and spin-spin correlations functions. We argue that thespin liquid in the vicinity of 2D Lifshitz point (LP) is similar to the gappedHaldane phase in integer-spin 1D chains. We also consider a specific example ofa frustrated system with the spiral-N\'eel LP, the $J_1-J_3$ antiferromagnet onthe square lattice that manifests the spin liquid behavior. We presentnumerical series expansion calculations for this model and compare results ofthe calculations with predictions of the developed field theory.

Properties of the spin liquid phase in the vicinity of the N\'eel - Spin-Spiral Lifshitz transition in frustrated magnets