Static Holes in the Geometrically Frustrated Bow Tie Ladder

Details Static Holes in the Geometrically Frustrated Bow Tie Ladder Static Holes in the Geometrically Frustrated Bow Tie Ladder

2007-05-27

arxiv.org/abs/0705.3985v1

J. Phys.: Condens. Matter 20 (2008) 415204

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 9 eps figures

Scientific paper

10.1088/0953-8984/20/41/415204

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. In the doped case, we find that static holes polarize their vicinity by a localization of singlets in order to reduce 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.

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