Excitation Spectra of Square Lattice Antiferromagnets (eBook, PDF)

Excitation Spectra of Square Lattice Antiferromagnets (eBook, PDF)

Theoretical Explanation of Experimental Observations

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This thesis presents a qualitative advance in our understanding of quantum effects in layered magnetic materials. The nearest neighbor Heisenberg ferromagnetic ranks among the oldest and most fundamental models of quantum many body effects. It has long been established that in one dimension quantum fluctuations lead to a quantum disordered ground state with fractional excitations called spinons." In two dimensions, the ground state of the Heisenberg model displays static order and to first approximation the dynamics can be described as semi-classical spin waves. Through theoretical advances th...

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