Antiferromagnetism and Stripe Channel Order in the SU ( N ) -Symmetric Two-Channel Kondo Lattice Model
Abstract
We carry out large-scale, sign-problem-free determinant quantum Monte Carlo simulations of the square lattice SU(N)-symmetric two-channel Kondo lattice model at half-filling. We map out the zero-temperature phase diagram for N=2, 4, 6, and 8, as a function of the Kondo coupling strength. In the weak-coupling regime, we observe antiferromagnetic order of the localized moments. Remarkably, for N≥6, sufficiently strong Kondo coupling induces spontaneous channel symmetry breaking, forming a stripe dimerization pattern with a wave vector k=(π,0) alternating between channels. These findings are supported by a complementary large-N saddle point analysis, which identifies the striped hybridization pattern as the energetically preferred configuration. The spatial symmetry breaking results in an anisotropic Fermi surface reconstruction.
Fields of Study & Subjects
Physics of Superconductivity and Magnetism
Rare-earth and actinide compounds
Magnetism in coordination complexes
Publication details
- Journal / source
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Volume
- 137
- Issue
- 3
- Pages
- 036504–036504
- Publication date
- 20 May 2026
- Language
- EN