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 24 for “"many-body system"”.
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Applying AdS/CFT to many body systems
In this thesis, we model a many body system by a conformal field theory, and calculate the correlation function of a scalar operator in this theory using the AdS/CFT correspondence. We describe numerical techniques for calculating the retarded Green function of the operator. The results suggest …
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Light-induced many-body correlations in ultracold gases
… very weak light into the cavity which contains many neutral atoms. We control the properties of the incoming photon, such as the polarization and/or the frequency spectrum, to obtain the final atomic states as desired. The photon transmitted through the cavity interacts with the atomic ensemble …
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An experimental study of direct and compound nuclear processes in neutron and deuteron induced reactions
… interaction are difficult to predict for a many-body system such as the nucleus. A great deal of effort has therefore been spent on developing simple models each of which emphasises a particular aspect of nuclear structure. Two of these, the compound nucleus and direct interaction models, …
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An experimental study of direct and compound nuclear processes in neutron and deuteron induced reactions
… interaction are difficult to predict for a many-body system such as the nucleus. A great deal of effort has therefore been spent on developing simple models each of which emphasises a particular aspect of nuclear structure. Two of these, the compound nucleus and direct interaction models, …
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Prethermalization and localization in quantum spin chains
How can a quantum many-body system escape the fate of thermalization is of importance to both fundamental study of quantum statistical physics and applications in quantum devices. Here we develop novel experimental and computational tools to address this question. First, novel control techniques …
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The Runny Gauge Plasma: shear viscosity to entropy for quarks and gluons
… of the coupling and charge screening in a many- body system. We emphasise that because the effective interaction strength, for a QGP, may vary considerably at the relevant scales, the running of the coupling cannot be ignored. The goal of this thesis is to understand better a specific, …
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Black hole singularities in the framework of gauge/string duality
… SU(N) Yang-Mills theory on a sphere, a bounded many-body system. The signatures of the singularity we found are only present as N -+ oo. To elucidate the emergence of the singularity in the gauge theory we further study the large N limit. We argue that in the high temperature phase the theory is …
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Matter wave optical techniques for probing many-body targets
… of the uses of matter waves to probe many-body targets. We begin by discussing decoherence in an atom interferometer, in which a free gas acts as a refractive medium for a matter wave. The correlations that develop between the probe and the gas reduce the contrast of the interference …
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Measurement of charged particle multiplicity distribution in Au + Au collisions up to 200 GeV
… about the dynamics of a strongly interacting many-body system in this non-perturbative regime. Therefore, characterizing the collisions using global extrinsic observables becomes important. The distribution of charged particles produced in an ultra-relativistic heavy ion collision, being …
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Phase Stabilised Superlattices for Quantum Simulation
… control of tunnelling and interactions in the many-body system to observe the Mott-insulator transition in the triangular and kagome lattices. We also detail current progress towards achieving a state in thermodynamic equilibrium in the kagome flat band and demonstrate the creation of a …
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Quantum Stochastic Processes and Quantum Many-Body Physics
… processes and its applications in quantum many-body physics. The main goal is to analyse complexity-theoretic aspects of both static and dynamic properties of physical systems modelled by quantum stochastic processes. The thesis consists of two parts: the first one addresses the …
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Aspects of symmetry, topology and anomalies in quantum matter
… the new physics and richness of quantum many-body system phenomena is one of the stimuli driving the condensed matter community forward. Importantly, the new insights and solutions for condensed matter theory sometimes come from the developed and developing knowledge of high energy …
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Creating novel quantum states of ultracold bosons in optical lattices
… control the effects of heating that couple the system to states that lie outside the Hilbert space we wish to engineer. In this thesis, I describe a series of experiments and theoretical proposals that address several critical issues facing ultracold atoms in optical lattices. First, I describe …
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Symmetry and its Signatures in Quantum Many-Body Dynamics
… feature in our understanding of statistical or manybody systems. By making appeals to universal properties associated with global symmetries and topology, one may describe universal properties of “typical” states and dynamics in equilibrium, even when keeping track of the precise dynamics of a …
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Topics in Spin-Orbit Coupling in Cold Atoms and Semiconductors
… an optically induced spin-orbit interaction on a system of Bosonic atoms. The spin-orbit term couples the emergent pseudo-spin- 1/2 degree of freedom to momentum. The single particle energy spectrum has a low energy band with two minima at non-zero momentum. At low temperatures, a many-body system …
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Ultracold quantum gases in three-dimensional optical lattice potentials
… on experiments that enter a new regime in the many body physics of ultracold atomic gases. A Bose-Einstein condensate is loaded into a three-dimensional optical lattice potential formed by a standing wave laser light field. In this novel quantum system we have been able to both realize a …
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Controlling exciton dimensionality in novel transition-metal dichalcogenide platforms
… of investigating long-ranged interactions in a many-body system. I find lifetimes approaching 0.2 ms for the unconfined excitons, longer by an order of magnitude than previous reports. I use an array of nanopillars to deterministically strain confine these interlayer excitons to zero dimensions …
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Efficiently Learning, Testing, and Simulating Quantum Many-Body Systems
… and their applications in studying quantum many-body systems. A remarkable interplay between computer science and quantum physics in the past few decades has revealed that a precise control and manipulation of interacting quantum systems enables us to process information and perform …
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Exploring Novel Quantum Physics Using Ytterbium-171 in An Optical Cavity
… of a cavity quantum electrodynamics (CQED) system using single or multiple ensembles of ytterbium-171 atoms and its use for quantum metrology and quantum information science investigations. We develop and study a unified theoretical framework that describes CQED spin systems. We unify the …
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Nuclear Wavefunctions of Dispersion Bound Systems: Endohedral Eigenstates of Endofullerenes
… observable properties of the endohedral system, as well as plots of the nuclear orbitals. Starting from the highly symmetric He@C60, this thesis investigates its translational energies and makes comparisons with experimental data. This system is studied using a variety of electronic …
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