Phase Diagram of the Two-Leg Kondo Ladder

Details Phase Diagram of the Two-Leg Kondo Ladder Phase Diagram of the Two-Leg Kondo Ladder

2004-05-17

arxiv.org/abs/cond-mat/0405380v2

Phys Rev B 70 172415 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figs

Scientific paper

10.1103/PhysRevB.70.172415

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 $n\gtrsim0.4$ 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 $n\lesssim0.5$, and at $\vec{q}$=$(n,1)\pi$ for $n\gtrsim0.5$. The charge structure factor suggests that electrons behave as free particles with spin-1/2 (spin-0) for small (large) $J$.

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