The effective charge velocity of spin-¹/2 superlattices
AUTOR(ES)
Silva-Valencia, J., Franco, R., Figueira, M. S.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2006-09
RESUMO
We calculate the spin gap of homogeneous and inhomogeneous spin chains, using the White's density matrix renormalization group technique. We found that the spin gap is related to the ration between the spin velocity and the correlation exponent. We consider a spin superlattice, which is composed of a repeated pattern of two spin-¹/2 XXZ chains with different anisotropy parameters. The behavior of the charge velocity as a function of the anisotropy parameter and the relative size of sub-chains was investigated. We found reasonable agreement between the bosonization results and the numerical ones.
Documentos Relacionados
- The spin-1/2 ising model with skew magnetic field at high temperatures
- Equivalence between the planar Dirac oscillator and a spin-1/2 fermion embedded in a transverse homogeneous magnetic field
- Equivalence between the Dirac oscillator and a spin-1/2 fermion embedded in a transverse homogeneous magnetic field: movement in a (2 + 1)-dimensional world
- "Efeito Aharonov-Bohm não-comutativo para partículas relativísticas de spin 1/2"
- Silicon-based spin and charge quantum computation
