An effective theory combining perturbation theory for disordered phases and quadratic-plus-quartic approximations for ordered phases describes the quantum ground states of the dipolar planar rotor chain and matches numerical benchmarks.
Sinceg<g c ≪1 in the disordered phase, higher order terms are not essential to capture the physics of that regime
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Effective theory of quantum phases in the dipolar planar rotor chain
An effective theory combining perturbation theory for disordered phases and quadratic-plus-quartic approximations for ordered phases describes the quantum ground states of the dipolar planar rotor chain and matches numerical benchmarks.