We investigate the Hubbard chain at half band filling with additional nearest-neighbor and next-nearest-neighbor spin exchange J1 and J2 using bosonization and the density-matrix renormalization group. For J2 =0 we find a spin-density-wave phase for all positive values of the Hubbard interaction U and the Heisenberg exchange J1. A frustrating spin exchange J2 induces a bond-order-wave phase. For some values of J1, J2, and U, we observe a spin-gapped metallic Luther-Emery phase.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Aug 25 2008|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics