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 29 for “"fluctuation-dissipation theorem"”.
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Assessing electronic transport in solid materials via the fluctuation-dissipation theorem
For the first-principles evaluation of electronic heat and charge transport coefficients, the Kubo-Greenwood formalism represents an appealing alternative to perturbative approaches, since it naturally incorporates all orders of anharmonic and vibronic effects. In practice, however, Kubo-Greenwood …
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Stochastic congruence equations for spacetime fluctuations
… a method for analyzing the effects of curvature fluctuations on spacetime thermodynamics. This is done by examining the evolution equations for time-like and null congruences, and recasting them as stochastic differential equations. The purpose of viewing the congruence evolution equations as …
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Large Scale Simulations of Brownian Suspensions
… Brownian motion. For interacting particles, the fluctuation-dissipation theorem requires that the individual Brownian forces satisfy a correlation based on the N body resistance tensor R. The accurate modeling of these forces requires the computation of a matrix square root R 1/2 for matrices up …
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Electromagnetic analysis with discrete exterior calculus
… The discrete version of many electromagnetic theorems are derived. Then a numerical Green's function (NGF) is introduced to incorporate DEC into integral equations. With interior surface relation formulated with NGF and exterior relation from surface integral equations (SIEs), we present an …
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Electrically-tunable near-field heat transfer with ferroelectric materials
… for heat transfer applications. Using the fluctuation-dissipation theorem and the Dyadic Green's function method, the author shows via simulation that the magnitude and spectral characteristics of radiative heat transfer can be tuned via an externally applied electric field and temperature. …
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Modeling of the dynamics of autonomous catalytic nanomotors using the method of regularized stokeslets
… from complicated surface geometry, the Brownian fluctuations and the contact surface effects, necessitate appropriate theoretical modeling and use of computational methods and tools to accurately simulate particle dynamics. The swimming behavior exhibited by catalytic nanomotors designed by our …
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An action principle for dissipative fluid dynamics
… encodes the effects of thermal and quantum fluctuations. In our formulation, the dynamical degrees of freedom are Stuckelberg-type fields associated to the conserved quantities, which are subject to natural symmetry considerations, and the time evolution of the path integral is along the …
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The Stochastic Dynamics of Optomechanical Sensors for Atomic Force Microscopy
… deterministic numerical calculations and the Fluctuation-Dissipation Theorem. This is possible because the same molecular processes, Brownian motion, cause both the fluctuations of the nanobeam and the dissipation of the nanobeam.
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Chain dynamical theories of protein folding
… glass transition signaled by a violation of the fluctuation-dissipation theorem. Next, we develop a variational theory for the smooth free energy surface of minimally frustrated proteins. In this theory, ensembles of structures along an average folding route (identified by the stationary points …
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Fluid dynamics in action
… as a systematic approach to thermal and quantum fluctuations around the classical motion of fluids. The dynamical degrees of freedom are Stuckelberg-like fields associated with diffeomorphisms and gauge transformations, and are related to the conservation of the stress tensor and a U(1) current …
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Fermion pairing and correlations under a quantum gas microscope
… gas, we detect local doublon-hole quantum fluctuations within the Mott insulator, which in turn establish long range magnetic order. Leveraging the technique of full density imaging, we implement model-independent thermometry of the strongly interacting system using the …
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Molecular simulations of the interaction of microwaves with fluids
… processes occurring at the molecular scale. The fluctuation-dissipation theorem relates the frequency-dependent dielectric constant of a material to equilibrium fluctuations in its dipole moment. This fact can be used to determine dielectric properties from equilibrium molecular dynamics …
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Photon management in thermal and solar photovoltaics
… emission for TPV systems. Calculations based on fluctuation-dissipation theorem and Maxwell's equations are presented to study radiative heat transfer between two closely-spaced glass plates. The theoretical analysis shows that the radiative heat transfer between closely-spaced glass plates is …
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A linear response analysis of electromagnetic radiation emanating from a plasma
… made to determine the radiation (due to current fluctuations) that emanates from a high-density, low-temperature ""quantum"" plasma, and in the classical limit, for a low-density, high-temperature ""classical"" plasma. Radiation due to field fluctuations that are independent of current …
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Relaxation phenomena during non-equilibrium growth
… phase diagram is constructed. We discuss global fluctuation-dissipation ratios and how to use them for the characterization of non-equilibrium growth processes. We also numerically study the same two-time quantities for the non-linear Kardar-Parisi-Zhang equation. For global functions related to …
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Microscopic Theory of Linear Response in Amorphous Materials
… a route to the (both Markovian and nonMarkovian) fluctuation-dissipation theorem (FDT) and gives rise to the generalised Langevin equation (GLE) in classical dynamics. In the first place, I extend the GLE and the corresponding FDT for more general cases where both the tagged particle and bath …
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Correlation Force Spectroscopy for Single Molecule Measurements
… micro-cantilevers that undergo thermal fluctuations. Measurement of the correlation in thermal fluctuations of the two cantilevers can be used to determine the mechanical properties of the soft matter, e.g. a polymeric molecule, that connects the gap between the two cantilevers. Modeling …
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Resonance Fluorescence in a Photonic Crystal
… In the Markovian case, the quantum regression theorem is valid. In the general case, the fluctuation dissipation theorem can be used instead. The two-time correlation functions are calculated by the two different methods. Within the chosen approximations, both methods deliver the same result. …
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Steered molecular dynamics: a tool to investigate molecular interactions
… of macromolecules within the limits set by the fluctuation-dissipation theorem.
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Taming the Inverse and Forward Problems in Density Functional Theory
… energies using the adiabatic connection fluctuation-dissipation theorem. We expect that certain key insights derived from this work will assist in the informed development of improved functional approximations.
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