Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 56: Superconductivity: Theory I
TT 56.12: Vortrag
Mittwoch, 11. März 2026, 18:00–18:15, CHE/0089
Chiral superconductivity in time-reversal symmetry broken honeycomb systems — •Lucca Marchetti1, Matthew Bunney1,2, and Stephan Rachel1 — 1School of Physics, University of Melbourne, Melbourne, Australia — 2Institute for Theoretical Solid State Physics, RWTH Aachen University, Aachen, Germany
Rhombohedral graphene — stacked graphene layers in the ABC configuration — has emerged as an exciting playground for strongly correlated physics and superconductivity. Recent experiments on N-layer rhombohedral graphene reveal signatures of spin-valley polarised Fermi surfaces. Probes at low temperature exhibit several regions of superconductivity, with signs of chiral triplet pairing states.
To better discern how broken symmetries in the normal state affect underlying many-body states we focus on 2D single-layer honeycomb systems in the presence of various symmetry breaking terms. We employ the truncated-unity functional renormalization group technique to analyse the leading instabilities of the associated Hubbard model. We discuss how the different broken symmetries affect the resulting superconductivity, and the implications this has for chiral and/or triplet pairing states. We further characterise the superconducting states in a topological context through calculation of Chern number landscapes, where we find regions of topological superconductivity.
Keywords: Chiral superconductivity; Unconventional superconductivity; Topological superconductivity; Broken time reversal symmetry; Functional Renormalization Group