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Showing 1 to 20 of 266 for “"Hubbard"”.
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Hubbard trees and their properties.
A Hubbard tree is a set of points at the core of dendritic Julia sets. These trees encapsulate all the information about the larger Julia set, but in a much smaller, easier to understand structure. We discuss the structure of Hubbard trees, in particular, we provide a useful definition of branch …
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Exact and variational investigations of Hubbard rings
We study the one-dimensional Hubbard model for interacting electrons in a crystal lattice, using two methods: solution of the Lieb-Wu equations in the atomic limit of no intersite hopping, and variational techniques to obtain a lower bound for the ground state energy. From the Lieb-Wu equations we …
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Correlations in the one-dimensional Hubbard model
Correlation effects in the one-dimensional Hubbard model are studied by application of the L-resolvent method. The calculations are well beyond one-particle mean field approximation. All correlations involving two neighboring sites are included exactly and higher order correlations are …
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Quantum simulations on square and triangular Hubbard models
… a two-dimensional square- and triangular-lattice Hubbard model respectively. The formation of the superconducting dome requires explanations of feasible scenarios. Generally speaking, pairing strength is provided by magnetic fl_x001D_uctuations in the strongly correlated region and the structure …
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A Renormalisation Group Approach to the Hubbard Model
… temperature superconductors the two dimensional Hubbard model has attracted a lot of attention as a description of these materials. Intensive studies have revealed that indeed its phase diagram shows features known from high temperature superconductors. We study the two dimensional Hubbard model …
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The Extended Hubbard Model: Theory, Simulations, and Applications
The Hubbard model is one of the most widely studied many-body models for interacting electrons in solids. Here we present a study of the Extended Hubbard model, which provides a more realistic description of real materials by including some longer-range Coulomb interactions. We discuss the …
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The Extended Hubbard Model: Theory, Simulations, and Application
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-13T20:03:01Z No. of bitstreams: 1 1999_clay.pdf: 4762265 bytes, checksum: 0aa7a1eddaa6905e3f4b0e221520ac22 (MD5)
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Symmetry breaking in the Hubbard model : a bosonization approach
… can be suitably modelled by the two dimensional Hubbard model. To understand the interplay of various long range properties as antiferromagnetism and superconductivity, one can calculate the phase diagram of the Hubbard model in the charge density-temperature plane. This analysis is conveniently …
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Spatio-temporal dynamics of the disordered Bose-Hubbard model
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Exact Results on Extended Hubbard Models on One-Dimensional Chains
… is concerned with the investigation of Extended Hubbard Models on one-dimensional lattices (chains); the approach used to such investigation is that of determining exact results. The extended Hubbard models are models of correlated electrons on lattices; they are the extensions of a model …
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MULTI-BAND BOSE HUBBARD MODELS AND EFFECTIVE THREE-BODY INTERACTIONS
… many-body Hamiltonians. A single-band Bose-Hubbard (BH) Hamiltonian was first proposed to describe these systems in 1998 and its associated quantum phase-transition was subsequently observed in 2002. Over the years, there has been a rapid progress in experimental realizations of more complex …
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ΜΕΛΕΤΗ ΤΟΥ ΜΟΝΤΕΛΛΟΥ HUBBARD ΓΙΑ ΕΛΚΤΙΚΑ ΔΥΝΑΜΙΚΑ ΜΕΤΑΞΥ ΤΩΝ ΗΛΕΚΤΡΟΝΙΩΝ
WE STUDIED THE ONE-DIMENSIONAL HUBBARD MODEL WITH ATTRACTIVE ON SITE INTERACTIONS BETWEEN ELECTRONS BY USING THE PERIODIC ONE- BODY SELF CONSISTENT STATIC APPROXIMATION. OUR RESULTS ARE IN GOOD AGREEMENT WITH THE EXISTENT MANY-BODY RESULTS, FOR NUMBER OF ELECTRONS PER LATTICE SITE, TAKING ALL …
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Magnetic Phases of Narrow-Band Solids in the Hubbard Model
Made available in DSpace on 2015-05-12T22:38:57Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7317672.PDF: 2503839 bytes, checksum: d5d3e90ca34eaa190d6479c89beb6349 (MD5) Previous issue date: 1973
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Magnetic phases of narrow band solids in the Hubbard model
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-16T20:55:20Z No. of bitstreams: 1 1973_yang.pdf: 2675575 bytes, checksum: 6b06bcc6d9897891d92eebafed933fe4 (MD5)
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Hydrochemical Dynamics Under Differing Winter Climate Regimes at the Hubbard Brook Experiment Forest
… hydrochemical dynamics of drainage waters at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire, USA, that aims to improve understanding of changes in water quality associated with winter climate variation. The first phase was an analysis of the long-term stream and soil water chemistry …
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Soluciones exacta y adiabática para el modelo de Hubbard-Peierls en un cúmulo finito
… analiza la solución exacta del modelo de Peierls-Hubbard en un anillo de seis celdas, trabajando tanto las variables electrónicas como fonónicas dentro de un marco cuántico. Se considera una interacción electrón-electrón (G) entre celdas contiguas, suponiendo infinita la interacción Coulombiana …
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Hubbard-corrected density functional theory : sensitivity to projection-space and renormalization of Coulomb interaction.
Density functional theory augmented with a Hubbard correction (DFT+U ) has become a widely used framework for modeling materials in which localized d or f electrons give rise to strong electronic correlations. By introducing an explicit on-site Coulomb interaction, DFT+U can substantially improve …
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Bose-Hubbard physics in the kagome and triangular optical lattices at negative absolute temperature
This thesis describes quantum many-body experiments with ultracold bosonic ³⁹K in the kagome and triangular optical lattices. These lattices display geometric frustration, which manifests itself in a degeneracy at the upper edge of the ground band manifold. In the case of the triangular lattice, …
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