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 “"Bose-Hubbard"”.
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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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MULTI-BAND BOSE HUBBARD MODELS AND EFFECTIVE THREE-BODY INTERACTIONS
… quantum 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 …
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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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Few- and many-body physics of dipoles in ion traps and optical lattice simulators
… lattice boson systems. First, we study the Bose-Hubbard model for hard-core bosons, interacting via dipole-dipole interactions. The resulting extended Bose-Hubbard model can be experimentally realized by polar molecules, Rydberg atoms, or magnetic dipoles in optical lattices. We use quantum …
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Dynamics of ultracold bosons in a disordered optical lattice
… a disordered optical lattice to realize the 3D Bose Hubbard model, with independently, dynamically tunable lattice depth and disorder strength. The equilibrium behavior of the Bose Hubbard and disordered Bose Hubbard models are understood, but there are many outstanding questions about dynamics. …
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Quantum Dynamics of Strongly-Interacting Bosons in Optical Lattices with Disorder
… dynamics of states derived from the disordered Bose-Hubbard model in a trapping potential. We find that the edge states in the trap allow center of mass motion even with insulating states in the center. We identify short and long-time mechanisms for edge state transport in insulating phases. We …
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An Exploration of Quantum Critical Phenomena in One-Dimensional Lattice Systems: Geometric Frustration & Quantum Fluctuations
… and we will explore an extension of the standard Bose-Hubbard model on a one-dimensional lattice with a non-trivial elementary cell.<br/><br/>Our first main focus will be on the use of entanglement scaling as an indicator of when a phase transition has occurred, more specifically for first-order …
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Studies of Integrable One-Dimensional Quantum Systems
… state occurrences between the 2-particle XXZ, Bose–Hubbard, and Fermi– Hubbard models. In the next chapter, I introduce ‘quenches’ and use the BA in order to calculate quench overlaps in the Lieb–Liniger model. In the final chapter, I introduce the spatial von Neumann bipartite entanglement …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… out-of-equilibrium phenomena in the Bose-Hubbard Model and exploring novel cooling techniques for ultracold gases in optical lattices. In the first experiment, we study quenches across the Mott-insulator-to-superfluid quantum phase transition in the 3D Bose-Hubbard Model. The quench …
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Strongly correlated ultra-cold bosonic atoms in optical lattices
… The model, an extension of the well known Bose-Hubbard model, develops a novel local Mott phase in addition to the usual Mott and superfluid phases in the homogeneous system. This might provide a new insight to the description of atomtronics applications. Finally, we study the two species …
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Compressibility of a bosonic Mott-insulator in a disordered optical lattice
… interacting bosons called the ""disordered Bose--Hubbard model"" using ultracold 87Rb atoms moving in a disordered optical lattice. The ground-state phase diagram of the disordered Bose--Hubbard model at unit filling and zero-temperature is largely considered to be settled from a theory …
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Aspects of Quantum Fluctuations under Time-dependent External Influences
… Afterwards, we turn our attention towards Bose-Einstein condensates, a laboratory system. Since most of our calculations are performed using a mean-field expansion, we will study the accuracy of a finite-range interaction potential onto such an expansion. Exploiting the universality of …
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Quantum Simulation of Many-body Systems with Superconducting Qubits
… across the energy spectrum of a hard-core Bose-Hubbard lattice by extracting correlation lengths and entanglement entropy of superposition states generated in particular regions of the spectrum, from the band center to its edge. The results presented in this thesis are in close quantitative …
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Effective action approach to quantum phase transitions in bosonic lattices
… results are applied to the concrete case of the Bose-Hubbard Hamiltonian on a three dimensional cubic lattice, and compared with the corresponding results from mean-field theory. Although both approaches yield the same Mott insulator - superfluid phase boundary to first order in the tunneling, …
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PRECISION MEASUREMENT TO STUDY STRONGLY CORRELATED SYSTEMS-FROM A SINGLE ION TO PHONONS IN AN ION CHAIN
… the dynamics are governed by strongly correlated Bose-Hubbard Hamiltonian. Trapped ion system allows us to tune the onsite phonon-phonon interaction from positive to negative which leads to several interesting phenomena which have been investigated in the theoretical section. One of this studies …
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Optical investigation of many-body interactions in transition metal dichalcogenide heterostructures
… for investigations of exciton-polarons, Fermi-Hubbard or Bose-Hubbard physics.
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Control, gates, and error suppression with Hamiltonians in quantum computation
… gates using a few interacting bosons obeying a Bose-Hubbard Hamiltonian on a line. We find high-fidelity logic operations for a gate set (including the CNOT gate) that is universal for quantum information processing. Lastly, we discuss the quantum complexity class QMA-complete, surveying all …
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Properties of dirty bosons in disordered optical lattices
The study of the disordered Bose-Hubbard model is key to understanding the interplay of disorder and interactions. Despite many studies with uniform diagonal disorder, few have inquired into experimental realizations with an additional correlated off-diagonal disorder. The presence of a trap and …
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Strongly correlated quantum fluids and effective thermalization in non-Markovian driven-dissipative photonic systems
… collective behaviours such as the celebrated Bose-Einstein Condensation (BEC) phase transition, where a macroscopic fraction of a bosonic system of particles collapses below a critical temperature T_c on a single-particle state. Quantum coherence, when combined with inter-particle …
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Dynamics and properties of massive quantum vortices in binary mixtures of Bose-Einstein condensates
L'abstract è presente nell'allegato / the abstract is in the attachment
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