Spin conservation and Fermi liquid near a ferromagnetic quantum critical point

Details Spin conservation and Fermi liquid near a ferromagnetic quantum critical point Spin conservation and Fermi liquid near a ferromagnetic quantum critical point

2009-08-30

arxiv.org/abs/0908.4433v2

Phys. Rev. Lett. 103, 216401 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

replaced with the published version

Scientific paper

We propose a new low-energy theory for itinerant fermions near a ferromagnetic quantum critical point. We show that the full low-energy model includes, in addition to conventional interaction via spin fluctuations, another type of interaction, whose presence is crucial for the theory to satisfy SU(2) spin conservation. We demonstrate the consistency between a loop-wise expansion and a Fermi liquid description for the full model. We further show that, prior to the ferromagnetic instability, the system develops a Pomeranchuk-type instability into a state with zero magnetization but with p-wave deformations of the Fermi surfaces of spin-up and -down electrons (a spin nematic).

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