Weak-coupling approach to hole-doped<i>S</i>=1 Haldane systems
Weak-coupling approach to hole-doped<i>S</i>=1 Haldane systems
As a weak-coupling analogue of hole-doped S=1 Haldane systems, we study two models for coupled chains via Hund coupling; coupled Hubbard chains, and a Hubbard chain coupled with an S=1/2 Heisenberg chain. The fixed point properties of these models are investigated by using bosonization and renormalization group methods. The effect …