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.
Results
Showing 1 to 18 of 18 for “"zurek"”.
-
Observation of the Kibble-Zurek mechanism in a bosonic gas
… of defects at the domain boundaries. The Kibble-Zurek theory provides a description for this universal phenomenon, which applies to many different systems in nature, and it predicts a power-law dependence of the defect density on the quench rate. This thesis reports on the results of the …
-
Little Big Bangs in Helium-Three
… to the formation of vortex loops via the Kibble-Zurek mechanism. A consideration of the free energy available in the quenched region for the production of such vortices reveals that the Kibble-Zurek scaling law gives at best a lower bound on the defect spacing. Further, for quenches that fall far …
-
Topological Signatures for the Kitaev Chain in and out of Equilibrium
… to the Landau-Zener framework and the Kibble-Zurek mechanism where applicable. Particular emphasis is placed on the excitation density, the evolution of geometric phases, and the role of symmetries in constraining the dynamics. These ideas are explored in both the Kitaev chain and the Creutz …
-
Dynamics of ultracold bosons in a disordered optical lattice
… we observe is reminiscent of the quantum Kibble Zurek mechanism, where the relaxation timescale diverges and local fluctuations are ""frozen"" into the system near the phase boundary. Understanding how disorder impacts the Kibble Zurek paradigm about behavior near a phase boundary provides …
-
Tunneling in Degenerate Atomic Gases
… for the formation of vortices in the Kibble-Zurek scenario. Finally, Chapter 6 contains a discussion on the time-evolution of the many-body states in the absence of tunneling. The second part of the thesis (Chapter 7- Chapter 9) deals with fermionic systems below the BCS critical temperature. …
-
Computational studies of thermal and quantum phase transitions approached through non-equilibrium quenching
… One important milestone here is the Kibble-Zurek (KZ) mechanism, which provides a useful framework for describing a system with a transition point approached through a non-equilibrium quench process. I developed two efficient Monte Carlo techniques for studying phase transitions, one is for …
-
Effects of NAL-R amplification on consonant speech perception in hearing-impaired listeners
… the long-term average speech spectrum (LTASS ) (Zurek and Delhorne (1987), Posner and Ventry (1977)). The data demonstrated that the MCL approach led to consistent responses in all subjects. Based on these results, a more rigorous definition of audibility based on entropy and the Miller and …
-
Exploring protein fitness landscapes with new high-throughput technologies
The concept of a protein’s fitness landscape – an abstract space in which related sequences are close together and matched with their fitness – is a useful tool to visualize core principles of protein evolution. Acquiring a new function, for example the laboratory evolution of an enzyme to convert …
-
On the effects of masking of perceptual cues in hearing-impaired ears
… for both normal-hearing (NH) and HI listeners (Zurek and Delhorne, 1987). Based on an entropy measure, Trevino and Allen (2013) have shown that at most comfortable level (MCL) audibility is not the main issue for the HI ear. This observation is counter-intuitive. In this research group, we hope …
-
Spatiotemporal Dynamics of Snow-Free Frost Exposure in the Western Cordillera Seasonal Snow Zones
In the mountain ecosystems of the Western Cordillera, seasonal snowpack provides insulation for soils and vegetation against freezing temperatures. While temperatures are warming overall, concurrent declines in snowpack are removing this protective thermal blanket. This may lead to events where the …
-
Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
… entanglement was introduced by Ollivier and Zurek. This sort of non-classicality that can exist even in separable states, has raised so much aspiration for the potential applications, as they are less fragile than the entangled states. Therefore, of especial interest is to know if a bipartite …
-
Quantum discord, EPR steering and Bell-type correlations for secure CV quantum communications
… entanglement was introduced by Ollivier and Zurek. This sort of non-classicality that can exist even in separable states, has raised so much aspiration for the potential applications, as they are less fragile than the entangled states. Therefore, of especial interest is to know if a bipartite …
-
Non-equilibrium dynamics of ultracold atoms in optical lattices
… constitutes the first observation of the Kibble-Zurek mechanism in a quantum quench. We have reported our findings in Ref. [1]. In a second experiment, published in Ref. [2], we investigate dissipation as a method for cooling a strongly interacting gas. We introduce dissipation via a bosonic …
-
Propiedades moleculares, morfológicas y relajacionales de copolímeros bloque
… obtenidos se compa- ran con el modelo de Kibble-Zurek, desarrollado originalmente en el contexto del modelo standard.El control de la densidad de defectos puede realizarse aplicando una defor- mación controlada sobre el film de copol´ımero. En el tercer capítulo se estudia la formación de …
-
Fundamental Excitations of Nonconservative Quantum Fluids
… in a nonequilibrium analogue of the Kibble-Zurek mechanism. I also study the instability of vortices in this regime, which I show are unstable to self-slicing into dark solitons (Ising domain walls), the opposite transformation known to equilibria condensates, in which dark solitons are …
-
Topological phases, non-equilibrium dynamics and parallels of black hole phenomena in condensed matter
… dynamics lead to deviation from Kibble-Zurek physics and non-analyticities in adiabatic fidelity even within the topological phase. The second part of the thesis deals with uncovering structural parallels of black hole phenomena such as the Hawking-Unruh effect and quasinormal modes in …
-
Many-body entangled dynamics of closed and open systems for quantum simulators
… long-range interactions and analyze the Kibble-Zurek hypothesis via the defects generated in the ferro- and antiferromagnetic limits. These simulations reveal how the number of defects depends on the quench rate and the strength of the long-range interactions, where we find that the defect …
-
Explorations of engineered bosonic systems in ultracold atoms, oscillator networks, quantum spin chains, and space
DSpace SAF Submission Ingestion Package generated from Vireo submission #21359 on 2025-03-28 at 14:25:59