By Bastien Dalla Piazza
This thesis provides a qualitative improve in our knowing of quantum results in layered magnetic fabrics. the closest neighbor Heisenberg ferromagnetic ranks one of the oldest and such a lot primary versions of quantum many physique results. It has lengthy been verified that during one size quantum fluctuations bring about a quantum disordered floor country with fractional excitations known as spinons." In dimensions, the floor kingdom of the Heisenberg version screens static order and to first approximation the dynamics might be defined as semi-classical spin waves. via theoretical advances the writer demonstrates that at excessive strength round specific issues in reciprocal house those semi-classical spin-waves deconfine into fractional excitations reminiscent of the one-dimensional spinons. He thereby presents the 1st clarification of a long-standing experimental observation.
In the second one half his thesis Bastien Dalla Piazza develops a unified description of the magnetic excitation spectra of more than a few cuprate mum or dad compounds to the hot temperature superconductors.
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Excitation Spectra of Square Lattice Antiferromagnets: Theoretical Explanation of Experimental Observations (Springer Theses) by Bastien Dalla Piazza