Dynamical density matrix renormalization group study of spin and charge excitations in the four-leg ttJ ladder

Takami Tohyama, Michiyasu Mori, and Shigetoshi Sota
Phys. Rev. B 97, 235137 – Published 21 June 2018

Abstract

The ground state of the ttJ ladder with four legs favors a striped charge distribution for the parameters corresponding to hole-doped cuprate superconductors. We investigate the dynamical spin and charge structure factors of the model by using the dynamical density matrix renormalization group (DMRG) and clarify the influence of the stripe on the structure factors. The dynamical charge structure factor along the momentum direction from q=(0,0) to (π,0) clearly shows low-energy excitations corresponding to the stripe order in hole doping. On the other hand, the stripe order weakens in electron doping, resulting in fewer low-energy excitations in the charge channel. In the spin channel, we find incommensurate spin excitations near q=(π,π) forming an hourglass behavior in hole doping, while in electron doping we find clearly spin-wave-like dispersions starting from q=(π,π). Along the (0,0)(π,0) direction, the spin excitations are strongly influenced by the stripes in hole doping, resulting in two branches that form a discontinuous behavior in the dispersion. In contrast, the electron-doped systems show a downward shift in energy toward (π,0). These behaviors along the (0,0)(π,0) direction are qualitatively similar to momentum-dependent spin excitations recently observed by resonant inelastic x-ray scattering experiments in hole- and electron-doped cuprate superconductors.

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  • Received 29 March 2018
  • Revised 27 May 2018

DOI:https://doi.org/10.1103/PhysRevB.97.235137

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takami Tohyama1,*, Michiyasu Mori2, and Shigetoshi Sota3

  • 1Department of Applied Physics, Tokyo University of Science, Tokyo 125-8585, Japan
  • 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 3Computational Materials Science Research Team, RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 650-0047, Japan

  • *tohyama@rs.tus.ac.jp

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Issue

Vol. 97, Iss. 23 — 15 June 2018

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