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Antiferromagnetism and Stripe Channel Order in the SU(N)-Symmetric Two-Channel Kondo Lattice Model
Elyasaf Y Cohen1, Fakher F Assaad2,3, Snir Gazit1,4
1The Hebrew University of Jerusalem, Racah Institute of Physics, Jerusalem 91904, Israel.
None:
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.
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