Low-frequency current fluctuations in doped ladders

Abstract

Charge current static and dynamical correlations are computed by exact diagonalisation methods on a 2-leg t-t'-J ladder which exhibits a sharp transition between a Luther-Emery (LE) phase of hole pairs and a phase with deconfined holes. In the LE phase, we find short-range low-energy incommensurate current fluctuations which are intrinsically connected to the internal charge dynamics within one hole pair. On the contrary, when holes unbind, the maximum of the current susceptibility moves abruptly to the commensurate wavevector $\pi$ and strongly increases for decreasing doping suggesting an instability towards a staggered flux state at sufficiently small doping.

4 pages, 5 figures

References in corpus (2)

• Rung-Rung Current Correlations on a 2-Leg t-J Ladder
• Staggered Orbital Currents in a Model of Strongly Correlated Electrons

Cited by in corpus (10)

• Broken time-reversal symmetry in strongly correlated ladder structures
• Generalized two-leg Hubbard ladder at half-filling: Phase diagram and quantum criticalities
• Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases
• Staggered Flux Phase in a Model of Strongly Correlated Electrons
• Current Carrying Ground State in a Bi-layer Model
• Instability towards Staggered Loop Currents in the Three-Orbital Model for Cuprate Superconductors
• Orbital currents and charge density waves in a generalized Hubbard ladder
• Circulating-current states and ring-exchange interactions in cuprates
• Possible Z2 phase and spin-charge separation in electron doped cuprate superconductors
• New results for the t-J model in ladders: Changes in the spin liquid state with applied magnetic field. Implications for the cuprates