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TT: Fachverband Tiefe Temperaturen

TT 5: Frustrated Magnets - General 1 (joint session TT/MA)

TT 5.9: Vortrag

Montag, 16. März 2020, 11:45–12:00, HSZ 304

Typical Pure Quantum states and the thermodynamics of highly frustrated quantum magnets — •Andreas Honecker¹ and Alexander Wietek² — ¹Laboratoire de Physique Théorique et Modélisation, CNRS (UMR 8089), Université de Cergy-Pontoise, France — ²Center for Computational Quantum Physics, Flatiron Institute, New York, USA

Reliable computation of the low-temperature thermodynamic properties of highly frustrated quantum magnets remains a considerable challenge. Here we explore the power of Thermal Pure Quantum (TPQ) states implemented in the framework of a Lanczos method using examples of frustrated two-dimensional S=1/2 spin models. In particular, we present accurate results for the specific heat and magnetic susceptibility 2D S=1/2 Shastry-Sutherland model with up to 40 sites in the parameter regime relevant to SrCu₂(BO₃)₂ [1] that had remained inaccessible over the previous two decades.

[1] A. Wietek, P. Corboz, S. Wessel, B. Normand, F. Mila, and A. Honecker, Phys. Rev. Research 1, 033038 (2019).