Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 61: Topology – Poster

TT 61.11: Poster

Wednesday, March 11, 2026, 15:00–17:00, P4

Topological phases in the bosonic Haldane-Hubbard model — •Hannah Carolina Dürschmidt, Ajesh Kumar, and Achim Rosch — Institute for Theoretical Physics, University of Cologne, Zülpicher Straße 77, 50937, Köln, Deutschland

We study the interacting bosonic Haldane--Hubbard model at half filling, using a self-consistent parton mean-field approach. Within this framework, we map out the phase diagram and identify superfluid, Mott-insulating, and topological phases. The primary focus is on the effects of long-range interactions, which can cause spontaneous breaking of lattice translation symmetry. In addition to Mott insultaing states, we investigate topological phases with a finite Hall conductivity.

Keywords: Haldane-Hubbard model; Mean field theory; Topological phases