2007/05/27 by G. B. Martins, George B. Martins, Wolfram Brenig · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/20/41/415204
published as J. Phys.: Condens. Matter 20 (2008) 415204 · 7 pages, 9 eps figures
arxiv created 2007/05/27 · openalex publication_date 2008/09/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We investigate the doping of a geometrically frustrated spin ladder with static holes by a complementary approach using exact diagonalization and quantum dimers. Results for thermodynamic properties, the singlet density of states, the hole-binding energy and the spin correlations will be presented. For the undoped systems the ground state is non-degenerate, with translationally invariant nearest-neighbor spin correlations. For the doped case, we find that static holes polarize their vicinity through a localization of singlets, reducing the frustration. This polarization induces short range repulsive forces between two holes and an oscillatory behavior of the long range two-hole energy. For most quantities investigated, we find very good agreement between the quantum dimer approach and the results from exact diagonalization.