ENGLISH

Excitation Spectra of Square Lattice Antiferromagnets: Theoretical Explanation of Experimental Observations

By Bastien Dalla Piazza (auth.)

Book information

Publisher
Springer International Publishing
Year
2016
ISBN
978-3-319-26418-9, 978-3-319-26419-6
DOI
10.1007/978-3-319-26419-6
Language
english
Format
PDF
Filesize
8 MB (8044755 bytes)
Series
Springer Theses
Edition
1
Pages
XVII, 176\189
Time added
2016-03-14 21:35:01
Magnetic Materials; Quantum Information TechnologyMagnetismSpintronics; Quantum Physics; Optical and Electron

Description

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 the author demonstrates that at high energy around particular points in reciprocal space these semi-classical spin-waves deconfine into fractional excitations akin to the one-dimensional spinons. He thereby provides the first explanation of a long-standing experimental observation. In the second half of his thesis Bastien Dalla Piazza develops a unified description of the magnetic excitation spectra of a range of cuprate parent compounds to the high temperature superconductors.

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