Spin-charge separation and kinetic energy in thet−Jmodel

Spin-Charge Separation and Kinetic Energy in the t-J Model

The effect of spin-charge separation on the kinetic energy of the two-dimensional t-J model is examined. Using a sum rule, we derive an exact expression for the lowest possible KE (Ebound) for any state without doubly occupied sites. The kinetic energies of the relevant slave-boson and Schwinger-boson mean-field states are found to be considerably larger than Ebound. The MF states exhibit compl...

Spin-Charge Separation in Polyacetylene

Spin drag and spin-charge separation in cold fermi gases.

Low-energy spin and charge excitations of one-dimensional interacting fermions are completely decoupled and propagate with different velocities. These modes, however, can decay due to several possible mechanisms. In this Letter we expose a new facet of spin-charge separation: not only the speeds but also the damping rates of spin and charge excitations are different. While the propagation of lo...

0 Spin - Charge Separation and the Spin Quantum Hall Effect

We use quantum field theory methods to study the network model for the spin quantum hall transition. When the couplings are fine tuned in a certain way, the spin and charge degrees of freedom, corresponding to the supercurrent algebras su(2)0 and osp(2|2)−2 respectively, completely decouple. This simpler theory is exactly solvable and some critical exponents are computed and shown to agree with...

Quasi - Spin - Charge Separation and the Spin Quantum Hall Effect

We use quantum field theory methods to study the network model for the spin quantum Hall transition. When the couplings are fine tuned in a certain way, the spin and charge degrees of freedom, corresponding to the supercurrent algebras su(2)0 and osp(2|2)−2 respectively, decouple in the renormalization group flow. The infrared fixed point of this simpler theory is the coset osp(4|4)1/su(2)0 whi...