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arXiv · 2004.03250

Quantum and Thermal Phase Transitions of the Triangular SU(3) Heisenberg Model under Magnetic Fields

Daisuke Yamamoto·Chihiro Suzuki·Giacomo Marmorini·Sho Okazaki·Nobuo Furukawa
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Abstract

We study the quantum and thermal phase transition phenomena of the SU(3) Heisenberg model on triangular lattice in the presence of magnetic fields. Performing a scaling analysis on large-size cluster mean-field calculations endowed with a density-matrix-renormalization-group solver, we reveal the quantum phases selected by quantum fluctuations from the massively degenerate classical ground-state manifold. The magnetization process up to saturation reflects three different magnetic phases. The low- and high-field phases have strong nematic nature, and especially the latter is found only via a nontrivial reconstruction of symmetry generators from the standard spin and quadrupolar description. We also perform a semiclassical Monte Carlo simulations to show that thermal fluctuations prefer the same three phases as well. Moreover, we find that exotic topological phase transitions driven by the binding-unbinding of fractional (half-)vortices take place, due to the nematicity of the low- and high-field phases. Possible experimental realization with alkaline-earth-like cold atoms is also discussed.

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Daisuke Yamamoto, Chihiro Suzuki, Giacomo Marmorini, Sho Okazaki, Nobuo Furukawa. 2020-08-17. Quantum and Thermal Phase Transitions of the Triangular SU(3) Heisenberg Model under Magnetic Fields. https://doi.org/10.1103/physrevlett.125.057204

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