Emergent Fermi surface in a triangular-lattice SU(4) quantum antiferromagnet
Anna Keselman, Bela Bauer, Cenke Xu, Chao-Ming Jian
TL;DR
This paper demonstrates that an SU(4) quantum antiferromagnet on a triangular lattice hosts a gapless liquid state with an emergent Fermi surface of fractionalized fermions, combining numerical and theoretical approaches.
Contribution
It provides the first evidence of an emergent Fermi surface in an SU(4) quantum antiferromagnet on a triangular lattice, using DMRG simulations and field theory analysis.
Findings
Evidence for a gapless liquid ground state.
Emergent Fermi surface of fractionalized fermions.
Coupling with a U(1) gauge field.
Abstract
Motivated by multiple possible physical realizations, we study the SU(4) quantum antiferromagnet with a fundamental representation on each site of the triangular lattice. We provide evidence for a gapless liquid ground state of this system with an emergent Fermi surface of fractionalized fermionic partons coupled with a U(1) gauge field. Our conclusions are based on numerical simulations using the density matrix renormalization group (DMRG) method, which we support with a field theory analysis.
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