Enlarged Symmetries of Spin Chains and Loop Models

N. Read, Hubert Saleur

Jos 'e A. Hoyos, E. Miranda

Alex Bols, Wojciech De Roeck, Michiel De Wilde +1 more

Alexey V. Onufriev, John Bradley Marston

Enlarged symmetry characterized by the group SU(4) can be realized in isolated semiconducting quantum dots. A Hubbard model then describes a pillar array of coupled dots, and at half-filling the system can be mapped onto an SU(4) spin chain. The physics of these structures is rich as novel phases are attainable. The spins spontaneously dimerize, and this state is robust to perturbations that break SU(4) symmetry. We propose ways to experimentally verify the existence of the dimerized phase.

Alexey V. Onufriev, Brad Marston

Enlarged symmetry characterized by the group SU(4) can be realized in isolated semiconducting quantum dots. A Hubbard model then describes a pillar array of coupled dots and at half-filling the system can be mapped onto an SU(4) spin chain. The physics of these new structures is rich as novel phases are attainable. The spins spontaneously dimerize and, by using the Density Matrix Renormalization Group (DMRG), we show that the dimer state is robust to perturbations which break SU(4) symmetry. We propose ways to experimentally verify the existence of the dimerized phase.

Christian Hagendorf