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TT: Fachverband Tiefe Temperaturen

TT 67: Dynamics and Chaos in Many-Body Systems II (joint session DY/TT)

TT 67.6: Talk

Friday, March 31, 2023, 11:00–11:15, MOL 213

Time evolution at the quantum-critical point of the sawtooth chain — •Jannis Eckseler, Florian Johannesmann, and Jürgen Schnack — Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany

It is known for the antiferromagnetic sawtooth chain with Heisenberg interactions to develop a flat band at the quantum-critical point of J₁ =2 J₂, where J₁ is the exchange interaction between nearest neighbors and J₂ the interaction at the base of the triangles [1]. We investigate the time evolution of several observables of the sawtooth chain, especially near that point and in particular in view of their equilibration properties. [1] J. Schulenburg, A. Honecker, J. Schnack, J. Richter, H.-J. Schmidt, Phys. Rev. Lett. 88 (2002) 167207