Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 16: Poster Ia
MM 16.3: Poster
Monday, March 18, 2024, 18:30–20:30, Poster E
Quantum Restored Symmetry Protected Topological Phases — •Dhruv Tiwari1, Steffen Bollmann1, Thomas Köhler2, Sebastian Paeckel3, and Elio J. König1 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Uppsala University, Uppsala, Sweden — 3Ludwig Maximilian University, Munich, Germany
Symmetry Protected Topological phases are paradigmatic for the non-trivial interplay of topology, symmetry, and interactions. For a given group of symmetries, it is already known that the topological classification can be different for interacting and non-interacting systems. On the other hand, one usually resorts to a mean-field approximation to study interacting systems where the tools of non-interacting topology can be employed to study topological characteristics. This raises the natural question as to what is the role of quantum fluctuations in the topological characteristics of interacting systems. We present an example of a system that is trivial under the mean-field approximation and shows topological characteristics upon the introduction of quantum fluctuations. To this end, we present results on an array of topological Cooper pair boxes. At half-filling, we observe the restoration of topological characteristics upon the introduction of quantum fluctuations. At quarter-filling, we obtain a richer phase diagram once we take into account the contribution of quantum fluctuations.
Keywords: Symmetry Protected Topological phases; mean-field approximation; quantum fluctuations; Cooper pair boxes