Static Holes in the Geometrically Frustrated Bow Tie Ladder

TL;DR

This paper explores how static holes affect a geometrically frustrated spin ladder, revealing polarization effects, short-range repulsion, and oscillatory interactions, with results validated by quantum dimer and exact diagonalization methods.

Contribution

It introduces a combined approach using exact diagonalization and quantum dimers to analyze doping effects in a frustrated spin ladder, highlighting polarization and hole interactions.

Findings

Static holes polarize their local environment.

Short-range repulsive interactions between holes.

Oscillatory behavior of two-hole energy at long range.

Abstract

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.