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 11 of 11 for “"fermionic systems"”.
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Effective Actions for Strongly Interacting Fermionic Systems
… methods for calculating the effective action for fermionic systems featuring bosonic bound states (BBS) and spontaneous symmetry breaking (SSB). In a purely fermionic language proceeding into the SSB phase requires techniques beyond perturbation theory and renormalization group equations. …
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Topological Signatures and Quenches in One Dimensional Fermionic Systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Benchmarking measurement-based quantum computation on graph states
… for the quantum simulation of time evolution in fermionic systems, using the Kitaev model and the Hubbard model as examples.
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Fermionic superfluids : from cold atoms to high density QCD : gapless (breached pair) superfluidity and kaon condensation
In this thesis, we explore aspects of fermionic superfluidity through a mean-field approximation. Our framework is extremely general, includes both pairing and Hartree-Fock contributions, and is derived rigorously from a variational principle. This framework allows us to analyze a wide range of …
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Tunneling in Degenerate Atomic Gases
… various tunneling effects in both bosonic and fermionic gases are investigated. The first part of this work deals with bosons in different Josephson-type experimental setups. After a brief general introduction we establish, in Chapter 2, a mapping between the phase and the Bogoliubov …
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Many-body decoherence with cold atoms in optical lattices
… faithful realisation of interesting many-body systems that are otherwise hard to study theoretically or experimentally. This thesis addresses the issue of many-body decoherence, using analytical and numerical techniques, in these optical lattice experiments that arises due to coupling to the …
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Topological Signatures for the Kitaev Chain in and out of Equilibrium
… dynamics of one-dimensional quadratic fermionic systems, with a primary focus on the Kitaev chain and related lattice models. A unified theoretical framework is developed based on quadratic Hamiltonians, their diagonalisation, and the use of correlation matrices to efficiently …
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Topics in multi-component ultracold gases and gauge fields
… gauge fields coupled to neutral ultracold systems using a light-induced Berry's connection have been rapidly developing. These methods are not only capable of creating Abelian gauge fields, such as a conventional magnetic field, but also non-Abelian gauge fields, which opens a way to …
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RECOVERY AND RECONSTRUCTION IN QUANTUM SYSTEMS
Quantum systems are prone to noises. Accordingly, many techniques are developed tocancel the action of a quantum operation, or to protect the quantum information against the noises. In this dissertation, I discuss two such schemes, namely the recovery channel and the quantum error correction, and …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
… of large, strongly interacting quantum systems impossible, and necessitates strategies to manage the complexity in an analytically or computationally tractable manner. The bulk of this thesis explores two such strategies in the context of quantum spin liquids. In these materials, …
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Exact Results on Extended Hubbard Models on One-Dimensional Chains
… the reference paradigm for treating all those systems in which electronic correlations cannot be neglected. \\As observed above, this thesis focuses in particular on 1-D chains: indeed in last years the progress in technological synthesization and small-scale observations has shown that there …