2007/05/25 by Kenji Ishii, K. Ishii, Ken‐Ichiro Tsutsui +14
Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Charge (physics) #Condensed matter physics #Excitation #Momentum (technical analysis) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scattering #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.045124
published as Phys. Rev. B 76, 045124 (2007) · 7 pages
arxiv created 2007/05/25 · openalex publication_date 2007/07/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Momentum-dependent charge excitations of a two-leg ladder are investigated by resonant inelastic x-ray scattering of (La,Sr,Ca)14Cu24O41. In contrast to the case of a square lattice, momentum dependence of the Mott gap excitation of the ladder exhibits little change upon hole doping, indicating the formation of hole pairs. Theoretical calculation based on a Hubbard model qualitatively explains this feature. In addition, experimental data show an intraband excitation as continuum intensity below the Mott gap and it appears at all the momentum transfers simultaneously. The intensity of the intraband excitation is proportional to the hole concentration of the ladder, which is consistent with optical conductivity measurements.