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 16 of 16 for “"Many-body Theory"”.
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Anharmonic vibrational many-body theory for molecules and extended systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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BEC-BCS crossover with Feshbach resonance for three-hyperfine-species model
… to predominated in the closed-channel. When the many-body energy scale (e.g. the Fermi energy, $E_{F}$) is larger than $\delta_c$, the closed-channel weight is significant and has to be included in the many-body theory. Furthermore, when two channels share a hyperfine species, the Pauli exclusion …
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Casimir-Polder interaction in second quantization
… thesis is to upgrade single-atom cQED with the many-body theory needed to describe trapped atomic BECs. Tools and methods are developed in a second-quantized picture that treats atom and photon fields on the same footing. We formulate a diagrammatic expansion using correlation functions for both …
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Characterizing and measuring properties of continuous-variable quantum states
… systems in the light of quantum information theory. We put an emphasize on systems with infinite-dimensional Hilbert spaces, so-called continuous-variable systems'', which are needed to describe quantum optics beyond the single photon regime and other Bosonic quantum systems. We present …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
"The central work of this thesis is many-body Green's Function Method calculations in atoms using Hedin's GW approximation with various vertex corrections, leading to polarizabilities and quasiparticle energies, which are electron addition (removal) energies corresponding to the lowest few …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
"The central work of this thesis is many-body Green's Function Method calculations in atoms using Hedin's GW approximation with various vertex corrections, leading to polarizabilities and quasiparticle energies, which are electron addition (removal) energies corresponding to the lowest few …
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First-principles density functional theory study of sulfur oxide chemistry on transition metal surfaces
… via first-principles density functional theory (DFT) computations, focusing on the chemical reactivity and selectivity in sulfur poisoning chemical processes that address environmental concerns. The systematic approach we establish can be extended to general computational studies of small …
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A complete calculation of Shear Viscosity in Strongly Interacting matter
… means of the microscopic Brueckner-Hartree Fock Many Body theory, that builds the in medio properties of interacting nucleons starting from the consistent treatment of realistic Bonn B 2-body vacuum interactions plus effective 3-body forces; Quark Matter is instead treated as a free gas of …
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Fission dynamics in a microscopic theory
… of the time-dependent density functional theory (TDDFT) to investigate the fission dynamics of atomic nucleus, which is still one of the most complicated problem in nuclear physics and a full microscopic interpretation is still missing. The establishment of the time-dependent superfluid …
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A variational theory of nuclear matter
… properties of nuclear matter, as well as the two-body data, has been hampered by the lack of an adequate many-body theory for treating the complicated forces involved. Realistic nucleon-nucleon potentials have strong spin, isospin, tensor and spin-orbit components which induce correspondingly …
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Tunable Electronic Excitations in Hybrid Organic-Inorganic Materials: Ground-State and Many-Body Perturbation Approaches
… for these materials employing density functional theory with corrections for van der Waals interactions and spin-orbit coupling. The set of 2D HOIPs investigated is found to be understandable within a quantum-well-like model with distinctive localization and nature of the electron and hole …
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Stochastic many-body problems in ecology, evolution, neuroscience, and systems biology
"Using the tools of many-body theory, I analyze problems in four different areas of biology dominated by strong fluctuations: The evolutionary history of the genetic code, spatiotemporal pattern formation in ecology, spatiotemporal pattern formation in neuroscience and the robustness of a model …
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Static and Dynamic Disorder in Emerging Optoelectronic Materials
… using first-principles electronic structure theory. We first investigate the III-V semiconductor boron arsenide, which exhibits similar absorption features to those of silicon but has a much higher room-temperature thermal conductivity. We employ density-functional theory (DFT) combined with …
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Universal quantum viscosity in a unitary Fermi gas.
… provide a paradigm to study nonperturbative many-body physics, which is of fundamental significance and crosses several fields.This dissertation reports the first measurement of the quantum shear viscosity in a6Li unitary Fermi gas, which is also the first measurement of a transport …
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The multi Davydov-Ansatz
… multi Davydov-Ansatz, an Ansatz of the bosonic many-body wave function in terms of moving Gaussian basis functions, to illuminate several aspects of open quantum system dynamics and quantum many-body theory. By two artifices alongside the time-dependent variational principle we extract from this …
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Assessment of Reactivity Descriptors for the Study of Chemical Reactions
… and chemical reactions. In this light, ab initio many body techniques enable us, without any experimental input, to compute molecular energetics and a whole range of chemical properties. A twofold classification can be made, separating wave function based methods (such as Hartree-Fock) from …