Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Quantum-Critical Phenomena (joint session TT/DY)

DY 3.4: Talk

Monday, March 9, 2026, 10:15–10:30, HSZ/0101

Inducing extraordinary-log criticality in the Heisenberg spin chain — •Grigorios Makris, Francesco Parisen Toldin, and Stefan Wessel — Institute for Theoretical Solid State Physics, RWTH Aachen University, Germany

We examine the ground state correlations emerging in a spin-1/2 Heisenberg chain upon coupling it to a quantum critical two-dimensional bilayer Heisenberg model. Based on the quantum-to-classical mapping and recent findings of unconventional surface criticality of three-dimensional classical Heisenberg models, extraordinary-log criticality is expected to become accessible within this setup along the coupled chain, which serves as a line defect. In particular, such a defect corresponds, through the quantum-to-classical mapping, to a planar defect in the classical case which exhibits extraordinary-log criticality. We use large-scale quantum Monte Carlo simulations to systematically explore this scenario, based on measurements of correlations and the spin stiffness, using the stochastic series expansion methods.

Keywords: Boundary criticality; extraordinary-log; defect; chain; bilayer Heisenberg