Quantum localization in bilayer Heisenberg antiferromagnets with site dilution

Details Quantum localization in bilayer Heisenberg antiferromagnets with site dilution Quantum localization in bilayer Heisenberg antiferromagnets with site dilution

2005-07-07

arxiv.org/abs/cond-mat/0507157v2

Phys. Rev. Lett. 95, 207206 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures; published version

Scientific paper

10.1103/PhysRevLett.95.207206

The field-induced antiferromagnetic ordering in systems of weakly coupled S=1/2 dimers at zero temperature can be described as a Bose-Einstein condensation of triplet quasiparticles (singlet quasiholes) in the ground state. For the case of a Heisenberg bilayer, it is here shown how the above picture is altered in the presence of site dilution of the magnetic lattice. Geometric randomness leads to quantum localization of the quasiparticles/quasiholes and to an extended Bose-glass phase in a realistic disordered model. This localization phenomenon drives the system towards a quantum-disordered phase well before the classical geometric percolation threshold is reached.

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