Inhomogeneous states in two-dimensional frustrated phase separation

Details Inhomogeneous states in two-dimensional frustrated phase separation Inhomogeneous states in two-dimensional frustrated phase separation

2009-05-11

arxiv.org/abs/0905.1739v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

We derive the phase diagram of a paradigmatic model of Coulomb frustrated phase separation in two-dimensional systems with negative short-range electronic compressibility. We consider the system subject either to the truly three-dimensional long-range Coulomb interaction (LRC) and to a two-dimensional LRC with logarithmic-like behavior. In both cases we find that the transition from the homogeneous phase to the inhomogeneous phase is generically first-order except for a critical point. Close to the critical point, inhomogeneities arrange in a triangular lattice with a subsequent first-order topological transition to stripe-like objects by lowering the Coulomb frustration. A proliferation of inhomogeneities which have inside smaller inhomogeneities is expected near all the transition lines in systems embedded in the three-dimensional LRC alone.

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