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 20 of 21 for “"Correlated electrons"”.
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Strongly Correlated Electrons on a Triangular Lattice
… we are going to study the properties of strongly correlated electron systems (SCES) using analytical, phenomenological and computational methods. In the introductory chapter we will discuss generally the problem of strongly correlated electron systems and the methods that are used to analyse their …
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Entangling symmetry and topology in correlated electrons
… (1) Novel SPT phases could emerge in strongly correlated systems, with no non-interacting counterpart. In particular, I will discuss interaction-enabled electron topological insulators, including their classification, construction, characterization and realization. (2) When strong interactions …
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Computational Studies of Correlated Electrons in One-Dimension
"We have studied the extended Hubbard and the Peierls-extended Hubbard models in one dimension using primarily computational methods. We discuss the derivation of the models and the computational methods used to study them, focusing primarily on our extensions over existing numerical methods. In …
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Slave particle study of the strongly correlated electrons
… our view of nature. For a system of electrons that is subject to a very strong interactions and/or strong correlations between electrons, these two frameworks may break down. There many phases of matter, e.g. spin liquids, that do not break any classical symmetry, but are separated by …
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Field theoretical methods for strongly correlated electron systems
… to the study of various systems of strongly correlated electrons in condensed matter physics, particularly to problems where a non-perturbative treatment is required.
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Variational study of strongly correlated electronic models
… in understanding the physics of strongly correlated electronic models. In particular the two simplest models for strongly correlated electrons, namely the Hubbard and t−J models, have been the subject of in- tensive studies. In a milestone paper of 1987, P.W. Anderson proposed that a …
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The role of inter-plane interaction in the electronic structure of high Tc cuprates
… structure due to the interaction between electrons and a bosonic mode was observed. Studying the doping, temperature, and momentum dependence of the photoemission spectra it was established that: the mode has a characteristic energy of 38-40 meV and causes strong renormalization of the …
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Doped Mott Hamiltonians
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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The fractional quantum Hall regime in graphene
… the quantum Hall ferromagnets as vacua on which correlated electrons or correlated holes are added. The predicted charge gaps and phase transitions between different fractional quantum Hall states are in good agreement with recent experiments. In the second part, we investigate the low energy …
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Controlling ultracold fermions under a quantum gas microscope
… model, which describes materials with strongly correlated electrons. After preparing ultracold 40K atoms in an optical lattice and performing Raman sideband cooling, single lattice site resolution was obtained. Metallic, Mott insulating, and band insulating states were observed in situ and local …
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A new fixed point for Mottness
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Emergent Critical Phases in Strongly Correlated Low-Dimensional Magnetic Systems
… often arise in the presence of strongly correlated electrons with reduced dimensions, in many cases in proximity to quantum critical points. This thesis contributes to the exploration of a relatively unexploited and highly fertile collection of van der Waals magnetic insulators known as …
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Single-atom imaging of 40K atoms via raman sideband cooling
… the classically inexplicable behaviour of correlated electrons in solid state systems. The second chapter briefly explores the techniques of preparation and control of dilute ultracold gases. The bulk of the thesis, chapters 3 and 4, deal with the design and optimization of the imaging …
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Competition and unification of Kondo coherence and magnetic ordering
… most puzzling problems in the field of highly correlated electrons. This is a quantum critical point separating a non-magnetic heavy fermi liquid metal from an antiferromagnetically ordered metal. The major problem facing us is the fact that, based on new experiments, these two phases seem to …
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Exploring the strongly correlated realm of electrons using scanning tunneling spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Superconductivity in the proximity of a quantum critical point
In a many-body fermionic system, the suppression of continuous transitions to absolute zero can result in a low temperature quantum fluid which deviates strongly from typical metallic behaviour; unconventional superconductivity can be induced by the strange metal region surrounding the …
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Electronic, thermoelectric and optical properties of vanadium oxides: VO2, V2O3 and V2O5
Correlated electrons in vanadium oxides are responsible for their extreme sensitivity to external stimuli such as pressure, temperature or doping. As a result, several vanadium oxides undergo insulator-to-metal phase transition (IMT) accompanied by structural change. Unlike vanadium pentoxide …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… intersection of low-dimensionality and strongly correlated electrons in van der Waals (vdW) materials offers a rich landscape of ordered phases and associated excitations for potential applications in nanoelectronics. The coupling between distinct degrees of freedom in correlated materials …
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Field theoretical methods for strongly correlated electron systems
… to the study of various systems of strongly correlated electrons in condensed matter physics, particularly to problems where a non-perturbative treatment is required. In the first part of this thesis we use this approach to investigate the Frustrated Quantum Antiferromagnet. We study the …
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Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
… the influence of coherent dynamics of the electrons as well as the electron-electron interaction are in focus of this survey and the resulting signatures as Rabi oscillations and characteristic spectra of photoelectrons are analysed. Furthermore, different levels of theory are applied for …
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