Phase Diagram of the Two-Leg Kondo Ladder

Abstract

The phase diagram of the two-leg Kondo ladder is investigated using computational techniques. Ferromagnetism is present, but only at small conduction electron densities and robust Kondo coupling $J$. For densities $n\gtrsim 0.4$ and any Kondo coupling, a paramagnetic phase is found. We also observed spin dimerization at densities $n$=1/4 and $n$=1/2. The spin structure factor at small $J$ peaks at $\vec{q}$=$(2n,0)\pi$ for $n\lesssim 0.5$, and at $\vec{q}$=$(n,1)\pi$ for $n\gtrsim 0.5$. The charge structure factor suggests that electrons behave as free particles with spin-1/2 (spin-0) for small (large) $J$.

5 pages, 4 figs

References in corpus (2)

• Dimerization induced by the RKKY interaction
• Correlation exponent K_rho of the one-dimensional Kondo lattice model

Cited by in corpus (3)

• Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model
• Absence of a true long-range orbital order in a two-leg Kondo ladder
• Determinant Quantum Monte Carlo Study of Exhaustion in the Periodic Anderson Model