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Alissa Geisinger

Persistence of Translational Symmetry in the BCS Model with radial pair interaction

Abstract: We consider the two-dimensional BCS functional with a radial pair interaction. We show that the translational symmetry is not broken in a certain temperature interval below the critical temperature. To this purpose, we first introduce the full BCS functional and the translation invariant BCS functional. Our main result states that the minimizers of the full BCS functional coincide with the minimizers of the translation invariant BCS functional for temperatures in the aforementioned interval. In the case of vanishing angular momentum our results translate to the three dimensional case. Finally, we will explain the strategy and main ideas of the proof.

This is joint work with Andreas Deuchert, Christian Hainzl and Michael Loss.