Rung-rung current correlations on a 2-leg t-J ladder - art. no. 100506

摘要

We report the results of numerical calculations of rung-rung current correlations on a 2-leg t-J ladder with J/t = 0.35 for dopings x = 0.125 and x = 0.19. We find that the amplitude of these correlations decays exponentially. We argue that this can be understood within a bosonization framework in terms of the pinned phase variables associated with a CISO phase with d(x)2(-y)2-like power law pairing correlations. We point out that coexistence of power law pairing correlations and orbital current correlations in any 2-leg ladder model requires the existence of at least two gapless boson fields. [References: 10]