Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 3 of 3 for “"HEISENBERG HAMILTONIAN"”.
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ΜΕΛΕΤΗ ΤΟΥ ΜΟΝΤΕΛΛΟΥ HUBBARD ΓΙΑ ΕΛΚΤΙΚΑ ΔΥΝΑΜΙΚΑ ΜΕΤΑΞΥ ΤΩΝ ΗΛΕΚΤΡΟΝΙΩΝ
… THE APPROXIMATION TRANSFORMS THE PART OF HUBBARD HAMILTONIAN, DESCRIBING "LATTICE EXCITATIONS", TO AN EQUIVALENT ANISOTROPICHEISENBERG HAMILTONIAN. THE RESULTING CONNECTION BETWEEN MAGNETISM THEORY SUPERCONDUCTIVITY AND CHARGE DENSITY WAVES, CONTRIBUTES TO THE UNIFIED UNDERSTANDING OF THESE …
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Creating novel quantum states of ultracold bosons in optical lattices
… Next, I report on the realization of a spin-1 Heisenberg Hamiltonian which emerges as the low energy effective theory describing spin ordering in the doubly-occupied Mott insulator of two spin components. This integer spin Heisenberg model is qualitatively different from the half-integer spin …
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Modern Electronic Structure Theory using Tensor Product States
… interaction (TPSCI), using a few model Hamiltonians and molecular examples. These numerical results show that TPSCI can be used to significantly reduce the number of SCI variables in the variational space, and thus paving a path for extending these deterministic and variational SCI …