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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Frustrated Magnets: General

TT 29.9: Vortrag

Mittwoch, 29. März 2023, 11:45–12:00, HSZ 201

Phases of the spin-1/2 Heisenberg antiferromagnet on the diamond-decorated square lattice in a magnetic field — •Nils Caci1, Katarína Karl'ová2, Taras Verkholyak3, Jozef Strečka2, Stefan Wessel1, and Andreas Honecker41Institute for Theoretical Solid State Physics, RWTH Aachen University, Germany — 2Department of Theoretical Physics and Astrophysics, P.J. Šafárik University, Košice, Slovakia — 3Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, L'viv, Ukraine — 4Laboratoire de Physique Théorique et Modélisation, CNRS UMR 8089, CY Cergy Paris Université, France

The spin-1/2 Heisenberg antiferromagnet on the highly frustrated diamond-decorated square lattice is a spin system of orthogonal spin dimers that features various ground-state phases, consisting of extended monomer-dimer and dimer-tetramer ground states as well as a ferrimagnetic regime. By using a combination of density matrix renormalization group (DMRG), exact diagonalization, as well as unbiased sign-problem free quantum Monte Carlo (QMC) methods, we investigate this system in the presence of a finite magnetic field. We find at high magnetic fields the emergence of a spin-canted phase, with continuously rising magnetization, as well as the fully polarized paramagnetic phase. At intermediate field strength, we identify the presence of a first-order quantum phase transition line between a ferrimagnetic phase and the monomer-dimer regime, which extends to finite temperatures and terminates in a line of critical points belonging to the Ising universality class.

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