Second-order Peierls transition in the spin-orbital Kumar-Heisenberg model

Wojciech Brzezicki, Imre Hagymási, Jacek Dziarmaga +1

We add a Heisenberg interaction term $\propto \lambda$ in the one-dimensional SU(2)$\otimes$XY spin-orbital model introduced by B. Kumar. At $\lambda =0$ the spin and orbital degrees of freedom…