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】

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