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Possible Inversion Symmetry Breaking in the S=1/2 Pyrochlore Heisenberg Magnet

MPS-Authors
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Hagymasi,  Imre
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Luitz,  David J.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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2010.03563.pdf
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Citation

Hagymasi, I., Schafer, R., Moessner, R., & Luitz, D. J. (2021). Possible Inversion Symmetry Breaking in the S=1/2 Pyrochlore Heisenberg Magnet. Physical Review Letters, 126(11): 117204. doi:10.1103/PhysRevLett.126.117204.


Cite as: http://hdl.handle.net/21.11116/0000-0008-EE6C-4
Abstract
We address the ground-state properties of the long-standing and much-studied three-dimensional quantum spin liquid candidate, the S = 1/2 pyrochlore Heisenberg antiferromagnet. By using SU(2) density-matrix renormalization group (DMRG), we are able to access cluster sizes of up to 128 spins. Our most striking finding is a robust spontaneous inversion symmetry breaking, reflected in an energy density difference between the two sublattices of tetrahedra, familiar as a starting point of earlier perturbative treatments. We also determine the ground-state energy, E-0/N-sites = -0.490(6)J, by combining extrapolations of DMRG with those of a numerical linked cluster expansion. These findings suggest a scenario in which a finite-temperature spin liquid regime gives way to a symmetry-broken state at low temperatures.