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Showing 1 to 20 of 76 for “"Hubbard model"”.
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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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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
… are cuprates, which 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 …
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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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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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Fourier-accelerated Langevin simulation of the frustrated XY model and simulation of the spinless and spin one-half Hubbard model
The frustrated XY model was studied on a lattice, primarily to test the Fourier transform acceleration technique for a phase transition having more field structure than just spinwaves and vortices. Also, the spinless Hubbard model without hopping was simulated using continuous variables for the …
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Theoretical study of interacting low dimensional electron systems
… of a strongly interacting many-body problem: the Hubbard model on one- and two-dimensional lattices. The technique employed is the small-cluster method wherein the full many-body Hamiltonian for finite clusters with periodic boundary conditions (PBC's) is solved exactly. We first apply this …
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The study of many-electron systems
… interacting systems. Two important many-particle models, the Anderson model and the Hubbard model, and their electromagnetic properties have been investigated in many parameter regimes, and applied to physical systems. An Anderson single-impurity model Hamiltonian based calculation of the magnetic …
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Dynamics in a Fermi lattice gas
… in a cubic optical lattice to simulate the Fermi-Hubbard model. The work in this thesis focuses on investigating dynamics in the Fermi-Hubbard model and developing techniques for engineering Hamiltonians beyond the minimal Hubbard model. We discussed three experiments. In the first, we …
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Quantum gas microscopy of strongly correlated fermions
… fermions. This enables one to simulate the Fermi-Hubbard model, a prototypical strongly correlated model, with site-resolved detectioi and control capablities. A new apparatus that can detect fermionic 40K in a square lattice with single-site resolution was constructed. High-fidelity site-resolved …
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Spectral properties of strongly correlated electron systems
… properties at zero temperature within the Hubbard an three-band-Hubbard model for the superconducting copper oxides. Based on the recently proposed self-energy functional approach (SFA) [M.Potthoff, Eur. Phys. J. B 32 429 (2003)], we present an extension of the cluster-perturbation theory …
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Improving first principles-based methods for correlated materials modeling
… and unbound anions. Hybrid approximations and Hubbard-model based correction functionals added to conventional semi-local xc approximations (e.g., DFT+U) offer potential solutions, but either at the expense of higher computational cost in case of the former or with the lack of a systematic …
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Transport properties in the vicinity of Mott insulators
… Mott insulating regime of the two dimensional Hubbard model. We then study the physics of nearby states where transport has been restored. First we consider doping of the Hubbard model in the strong coupling limit, i.e. the t-J model. Using the variational Monte Carlo technique, we study …
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Quantum simulations on square and triangular Hubbard models
… (or sodium cobaltates) which can be modeled by 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 …
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Transport and disorder-induced localization of ultracold Fermi gases
… autocorrelation length. We realize the Fermi Hubbard model by loading atoms in a cubic optical lattice. Non-equilibrium momentum distributions are created via Raman transitions, and the excitation relaxation rate is measured in the lattice. Transport experiments were performed in a disordered …
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