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 36 for “"Many-body interactions"”.
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Optical investigation of many-body interactions in transition metal dichalcogenide heterostructures
… as a novel platform for the investigation of many-body physical phenomena. In these systems, tightly bound excitons dressed by a gate-tunable Fermi sea form exciton-polarons, which are sensitive to Coulomb and spin interactions. In addition, TMD moir´e devices provide a highly tunable platform …
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Light scattering study of many-body interactions in two dimensional electronic systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Combinatorial algorithms for perturbation theory and application on quantum computing
… problems in quantum computing involve quantum many-body interactions. This dissertation concerns the problem of simulating arbitrary quantum many-body interactions using realistic two-body interactions. To address this issue, a general class of techniques called perturbative reductions (or …
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Investigating exciton correlations using coherent multidimensional optical spectroscopy
… measurements described in this thesis reveal interactions among bound electron-hole pairs known as excitons in a semiconductor nanostructure. Excitons are quasiparticles that can form when light is absorbed by a semiconductor. Exciton interactions gained prominence in the 1980s when unexpected …
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Data-driven approach to understanding exciton-exciton interactions in CsPbBr₃ nanocrystals
… optical gain development as well as many-body interactions between charge carriers more broadly. In this thesis, we develop and demonstrate a data-driven approach to characterizing the energetics and dynamics of biexciton states in CsPbBr₃ nanocrystals using TA spectroscopy.
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Molecular modeling of hydrate-clathrates via ab initio, cell potential, and dynamic methods
… surface between argon and water, corrected for many- body interactions, to predict monovariant and invariant phase equilibria for the argon hydrate and mixed methane-argon hydrate systems. A consistent set of reference parameters for the van der Waals and Platteeuw model, ... and ..., were …
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Computer Modeling of Silicon Quantum Dot Floating -Gate Flash Memory Devices
… density functional formalism, where the quantum many-body interactions are treated according to the local-density approximation. We investigate the quantum-dot electronic structure, device capacitance-voltage characteristics and derive the threshold voltage, VT, variation with single-electron …
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Coherent multi-exciton dynamics in semiconductor nanostructures via two-dimensional Fourier transform optical spectroscopy
… could reveal detailed information about complex many-body interactions and dynamics. However, unlike single-quantum coherences involving excitons, multiple-quantum coherences do not radiate and they have largely eluded direct observation and characterization. In this work, I present a novel …
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3D Chromatin Structure and Gene Regulation: Integrated Genome Structure, Transcriptomics and Epigenetics
… pairs enhances regulatory effects and that many-body interactions underpin tissue-specific expression. To enable systematic exploration, I created ChromPolymerDB, a high-resolution public database of ~10⁸ reconstructed chromatin structures at 5 kb resolution across 50 human cell types. With …
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Spin dynamics of bulk and quasi-two-dimensional metal halide based perovskite semiconductors
… of their spin dependencies on lattice and many-body interactions. Many of these results were obtained in close collaboration with others, as specified throughout the dissertation. First, we report that spin-dependent exciton interactions modify the exciton energy and induce spin …
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Pairing and superfluidity in strongly interacting Fermi gases
… between Bose-Einstein condensation (BEC) of two-body bound molecules and a Bardeen-Cooper-Schrieffer (BCS) superfluid of pairs bound by many-body interactions. We obtain the homogeneous phase diagram of the two -component gas with resonant interactions. As a function of temperature and spin …
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Theoretical Studies of Particle/Polymer Mixtures
… This result has significant consequences on the many-body interactions mediated by polymers between particles in the particle/polymer mixtures. The theory is then applied to study the phase behaviour of particle/polymer mixtures in electrolyte solutions wherein the particles are charged. Thus the …
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Many-body contributions to spin relaxation in semiconductors
… to both spin-dependent and spin-independent interactions. An effect typically driven by the spin-orbit interaction in semiconductors, spin relaxation describes the rate at which spin polarized particles return to an equilibrium spin distribution. This is generally in competition with the …
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Spectroscopy of Two Dimensional Electron Systems Comprising Exotic Quasiparticles
… studies of collective states emerging from interactions in electron systems confined to two dimensions. These studies span the first, second and third Landau levels. I report for the first time, high energy excitations of composite fermions in the quantum fluid at v = 1/3. The high energies …
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The effect of hydrostatic pressure on the ionic conductivity of some crystals with the flourite structure
… response of the material resulting from many-body interactions, or a combination of these two effects.
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Coherent light-matter interactions in monolayer transition-metal dichalcogenides
… energy levels by means of coherent light-matter interactions. Experiments were performed in a pump-probe technique using a transient absorption spectroscopy on MoS2 and WS2, and a newly developed XUV light source for time and angle-resolved photoemission spectroscopy (TR-ARPES) on WSe2 and WTe 2 …
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Towards Error-Resilience in Quantum Simulation of Lattice Gauge Theories
… processor. Efficiently synthesising the three-body matter-gauge coupling in the architecture's native gates allows for compact Trotter steps and enables us to reach substantial evolution times. We performed experiments remotely on the processors of Google Quantum AI, as part of their Early …
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Dynamics of plasmon-induced hot carriers in metallic nanoparticles
… and solar energy harvesting. Although many great features of hot electrons have been studied through previous works, the generation process and dynamics of them are still less understood. A more comprehensive theoretical model is needed to build the basic framework to predict and …
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Electrostatically-driven self-assembly of polyelectrolytes and colloidal tetrapods
… three themes. The first theme is the effective interactions and aggregation of rodlike polyelectrolytes. The second theme is the self-assembly of colloidal tetrapods using Monte Carlo simulation. The third theme is the new techniques that needed to be devised in order to perform this work. …
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