Manipulating topology of quantum phase transitions by symmetry enhancement
Oct 7, 2024Citations per year
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Abstract: (arXiv)
Topology plays a cardinal role in explaining phases and quantum phase transitions beyond the Landau-Ginzburg-Wilson paradigm. In this study, we formulate a set of models of Dirac fermions in 2+1 dimensions with SU()SU(2)U(1) symmetry that have the potential to host critical points described by field theories with topological terms. For it shows a rich phase diagram containing semimetallic, quantum spin Hall insulating, Kekulé valence bond solid and s-wave superconducting phases and features multiple Landau-Ginzburg-Wilson phase transitions driven by interaction strength. At a deconfined quantum critical point is observed. At one expects the critical theory to correspond to a level 2 Wess-Zumino-Witten theory in 2+1 dimensions. Here the numerical results however show a strong first order transition. Another transition can be governed by a topological -term which is rendered irrelevant for even values of thus leading to Landau-Ginzburg-Wilson behaviour.Note:
- 6 pages main text + 7 pages Supplemental Material, 3 figures main text + 9 figures Supplemental Material
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Figures(21)
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