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Title: Quantum spin structures and phase separation in the Hubbard model
Author: Asghar, Zahid Bin
ISNI:       0000 0001 3430 2048
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2001
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In this thesis we focus on a systematic study of the ground state of the one-dimensional one-band Hubbard model in the Hartree–Fock approximation. Phases with non-uniform charge density and states with coexisting phases separated by a domain wall are included in the study. We calculate the full Hartree–Fock phase diagram for uniform and non-uniform phases, and we show that at particular electron densities the uniform phase is unstable to phase separation. Supercell calculations are carried out, and we use the computational minimisation procedure to calculate the Hartree–Fock energies for the self-consistent spin configurations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available