Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: Correlated Electrons: Frustrated Magnets - Low-Dimensional Systems
TT 50.10: Talk
Wednesday, March 22, 2017, 17:30–17:45, HSZ 304
Intertwined nematic orders in a frustrated ferromagnet — •Yasir Iqbal1, Pratyay Ghosh2, Rajesh Narayanan3, Brijesh Kumar2, Johannes Reuther4,5, and Ronny Thomale1 — 1Institute for Theoretical Physics, Universität Würzburg, 97074 Würzburg, Germany — 2Jawaharlal Nehru University, New Delhi 110067, India — 3Indian Institute of Technology Madras, Chennai 600036, India — 4Freie Universität Berlin, 14195 Berlin, Germany — 5Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
We investigate the quantum phases of the frustrated spin-1/2 J1-J2-J3 Heisenberg model on the square lattice with ferromagnetic J1 and antiferromagnetic J2 and J3 interactions. Using the pseudo-fermion functional renormalization group technique, we find an intermediate paramagnetic phase located between classically ordered ferromagnetic, stripy antiferromagnetic, and incommensurate spiral phases. We observe that quantum fluctuations lead to significant shifts of the spiral pitch angles compared to the classical limit. By computing the response of the system with respect to various spin rotation and lattice symmetry-breaking perturbations, we identify a complex interplay between different nematic spin states in the paramagnetic phase. While retaining time-reversal invariance, these phases either break spin-rotation symmetry, lattice-rotation symmetry, or a combination of both. We therefore propose the J1-J2-J3 Heisenberg model on the square lattice as a paradigmatic example where different intimately connected types of nematicities emerge in the same model.