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  Simultaneous Dimerization and SU(4) Symmetry Breaking of 4-Color Fermions on the Square Lattice

Corboz, P., Lauchli, A. M., Penc, K., Troyer, M., & Mila, F. (2011). Simultaneous Dimerization and SU(4) Symmetry Breaking of 4-Color Fermions on the Square Lattice. Physical Review Letters, 107(21): 215301.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-8BC6-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-8BC7-1
Genre: Journal Article

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 Creators:
Corboz, P., Author
Lauchli, A. M.1, Author              
Penc, K.1, Author              
Troyer, M., Author
Mila, F., Author
Affiliations:
1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: YB 2012
 Abstract: Using infinite projected entangled-pair states, exact diagonalization, and flavor-wave theory, we show that the SU(4) Heisenberg model undergoes a spontaneous dimerization on the square lattice, in contrast with its SU(2) and SU(3) counterparts, which develop Neel and three-sublattice stripelike long-range order. Since the ground state of a dimer is not a singlet for SU(4) but a 6-dimensional irreducible representation, this leaves the door open for further symmetry breaking. We provide evidence that, unlike in SU(4) ladders, where dimers pair up to form singlet plaquettes, here the SU(4) symmetry is additionally broken, leading to a gapless spectrum in spite of the broken translational symmetry.

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 Dates: 2011-11-15
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 608125
ISI: 000297135600008
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Title: Physical Review Letters
Source Genre: Journal
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Pages: - Volume / Issue: 107 (21) Sequence Number: 215301 Start / End Page: - Identifier: ISSN: 0031-9007