Magnetic Excitations of Coupled Spin Ladders: a Quantum Monte Carlo Study

Abstract

We calculate the magnetic excitation spectrum in the stripe phase of high-T_c materials. The stripes are modeled as coupled spin-1/2 ladders and the spin dynamics is extracted using Quantum Monte Carlo (QMC) simulations, which can capture the strong quantum fluctuations near quantum critical points of coupled spin ladders. We find a characteristic hourglass magnetic excitation spectrum with high-energy peaks rotated by 45 degrees compared to the incommensurate low-energy peaks in good agreement with the experimental data. The excitations are investigated quantitatively as a function of interladder coupling, ladder width, and domain formation with stripe disorder.

4 pages, 5 figures (fig. 5 replaced)

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• Stripes in cuprate superconductors: Excitations and dynamic dichotomy
• Incommensurability and spin excitations of diagonal stripes in cuprates
• Modeling a striped pseudogap state
• Magnetic field-induced soft mode in spin-gapped high-Tc superconductors
• Pinning of stripes by local structural distortions in cuprate high-Tc superconductors