Two-band Luttinger liquid with spin-orbit coupling: Applications to monatomic chains on surfaces | |
Article | |
关键词: HEISENBERG ANTIFERROMAGNETIC CHAIN; CHARGE SEPARATION; ONE-DIMENSION; MODEL; SUSCEPTIBILITY; GAP; | |
DOI : 10.1103/PhysRevB.88.195113 | |
来源: SCIE |
【 摘 要 】
Recently, monatomic chains on surfaces have been synthesized that show evidence of Luttinger liquid physics. The experimental data point to a dispersion along the chain with four Fermi points. Here we investigate a general low-energy effective Hamiltonian for such a two-band model where SU(2) spin symmetry is broken but time-reversal symmetry persists, as is expected due to the surface geometry. Spin-orbit coupling gives rise to an energy scale epsilon(SO) much smaller than the Fermi energy epsilon(F) and to spin-nonconserving scattering processes. We derive the generic phase diagram at zero temperature as well as an effective phase diagram at temperatures epsilon(SO) < T << epsilon(F). For the part of the phase diagram where a Luttinger liquid is found to be stable, the density of states and the spectral function are calculated and discussed in relation to the experimental data.
【 授权许可】
Free