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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.17: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P4
Static and Dynamic Properties of Quantum Magnets: Results from Numerical Linked Cluster Expansion — •Alexander Schwenke and Wolfram Brenig — Institute for Theoretical Physics, Technical University Braunschweig, D-38106 Braunschweig, Germany
We consider static and dynamic properties of two-dimensional frustrated quantum antiferromagnets utilizing the numerical linked cluster expansion (NLCE). In particular, we are interested in spin-1/2 models showing quantum phase transitions versus internal parameters, e.g., the J1-J2 model on the square lattice or the triangular lattice XXZ model in external magnetic fields.
For the NLCE, we employ a single-site representation focussing on three topics: First, we present results for thermodynamic quantities, namely the internal energy and the specific heat at finite temperature. Second, we study the ground-state energy per site as a function of competing exchange coupling constants focussing on its second derivative. Finally, we investigate the dynamics of the system following a quantum quench.
Keywords: Numerical linked cluster expansion; Frustration; Thermodynamics; Dynamics