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TT: Fachverband Tiefe Temperaturen

TT 26: Correlated Magnetism – Frustrated Systems

TT 26.4: Vortrag

Dienstag, 10. März 2026, 10:15–10:30, HSZ/0103

Quantum Monte Carlo study of the Su-Schrieffer-Heeger model on a triangular lattice — •Disha Hou¹, Anika Götz¹, Jadson Silva², Natanael Costa², and Fakher Assaad¹ — ¹Institut für Theoretische Physik und Astrophysik, Universitat Würzburg, Würzburg, Germany — ²Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

We study the half-filled bond Su-Schrieffer-Heeger (SSH) model on the triangular lattice using sign-problem-free auxiliary-field quantum Monte Carlo methods. By varying the hopping matrix element, we interpolate between the assisted hopping limit — characterized by an emergent local Z₂ symmetry and phases in which the hopping is weakly modulated by phonons. In addition to a s-wave superconducting state and a staggered valence-bond solid state, we observe an emergent flux phase which, in the absence of fluctuations, would exhibit a Dirac dispersion. We find that this phase is gapped and does not appear to break any ultraviolet symmetries of the model, leading us to tentatively identify it as a gapped Z₂ quantum spin liquid phase.

Keywords: Quantum spin liquid; Electron-phonon coupling; Quantum Monte Carlo