Modulated phases of a 1D sharp interface model in a magnetic field

Details Modulated phases of a 1D sharp interface model in a magnetic field Modulated phases of a 1D sharp interface model in a magnetic field

2009-05-22

arxiv.org/abs/0905.3758v1

Phys. Rev. B 80, 134420 (2009)

Physics

Condensed Matter

Statistical Mechanics

12 pages, 3 figures

Scientific paper

We investigate the ground states of 1D continuum models having short-range ferromagnetic type interactions and a wide class of competing longer-range antiferromagnetic type interactions. The model is defined in terms of an energy functional, which can be thought of as the Hamiltonian of a coarse-grained microscopic system or as a mesoscopic free energy functional describing various materials. We prove that the ground state is simple periodic whatever the prescribed total magnetization might be. Previous studies of this model of frustrated systems assumed this simple periodicity but, as in many examples in condensed matter physics, it is neither obvious nor always true that ground states do not have a more complicated, or even chaotic structure.

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