The Luther-Emery liquid: Spin gap and anomalous flux period

@article{Seidel2005TheLL,
  title={The Luther-Emery liquid: Spin gap and anomalous flux period},
  author={A. Seidel and Dunghai Lee},
  journal={Physical Review B},
  year={2005},
  volume={71},
  pages={045113}
}
We study the dependence of the ground state energy on an applied Aharonov-Bohm flux $\ensuremath{\Phi}$ for the Luttinger model with large momentum scattering. Employing the method of finite size bosonization, we show that for systems with a spin gap but with gapless charge degrees of freedom, the ground state energy has an exact period of $hc∕2e$, i.e., half a flux quantum, in the limit of large system size $L$. Finite size corrections are found to vanish exponentially in $L$. This behavior is… Expand
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