Doped two-leg ladder with ring exchange

Abstract

The effect of a ring exchange on doped two-leg ladders is investigated combining exact diagonalization (ED) and density matrix renormalization group (DMRG) computations. We focus on the nature and weights of the low energy magnetic excitations and on superconducting pairing. The stability with respect to this cyclic term of a remarkable resonant mode originating from a hole pair-magnon bound state is examined. We also find that, near the zero-doping critical point separating rung-singlet and dimerized phases, doping reopens a spin gap.

5 pages, 7 figures, to appear in PRB

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Cited by in corpus (10)

• New Trends in Density Matrix Renormalization
• Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases
• High-energy magnetic excitations from dynamic stripes in LBCO (x=1/8)
• Experimental observation of the crystallization of a paired holon state
• Ground-state phase diagram of the extended two-leg $t$-$J$ ladder
• A Field Theory for Fermionic Ladder with Generic Intrachain Interactions
• Signatures of pairing in the magnetic excitation spectrum of strongly correlated ladders
• Pair Density Waves in coupled doped two-leg Ladders
• Hole Dispersions for Antiferromagnetic Spin-1/2 Two-Leg Ladders by Self-Similar Continuous Unitary Transformations
• Simulation of the Ring-exchange Models with Projected Entangled Pair States