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 9 of 9 for “"Spin-Boson Model"”.
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Dissipative Quantum Systems and Flow Equations
… Equations for Hamiltonians. We start with the Spin-Boson Model including one bosonic mode. The Flow Equation results for the ground-state energy and for the transformation of the Pauli spin matrices are compared with the numerically exact solution. For the Spin-Boson Model with an arbitrary …
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Electron transfer in solution : nonadiabatic dynamics and applications to catalysis
… master equation memory kernel for the spin-boson model, we apply our theoretical understanding to study the short-time dynamics of electron transfer beyond the Condon approximation in aqueous iron(II) / iron(III) electron self-exchange. We discuss the application of this method to …
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The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
… of temperature. A point-to-point tunneling model is built to describe the tunneling between two CuO2 planes including the in-plane Coulomb interaction. With a general assumption that the spectral function of the Coulomb uctuation is ohmic, the solution of the transmission rate in the model …
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Theoretical studies on the properties and dynamics of electronic excited states
… memory kernels for the linear vibronic coupling model, and employing them to calculate the population dynamics of the Fe(II)-Fe(III) self-exchange reaction. Finally, we present a relationship between perturbation theory traces of the spin-boson model that allows us to obtain the exact solution …
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Tensor network states simulations of exciton-phonon quantum dynamics for applications in artifcial light-harvesting
… conditions. Unfortunately, testing realistic models of noise assisted transport at the quantum level is challenging due to the intractable size of the environmental wave function. I developed a powerful tree tensor network states (TTNS) method that finds an optimally compressed explicit …
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Molecular dynamics studies of proteins under perturbations
… dynamics simulations, analyzed by theoretical models and compared with observations. (1) The response of temperature to temperature quenches and velocity reassignments are described in terms of the temperature autocorrelation function by the harmonic approximation. Models were developed to show …
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Simulation, characterisation and control of open quantum systems dynamics
… an accurate choice of the parameter regime, a spin-boson model can serve as a quantum analogue simulator of non-Markovian multiphoton Jaynes-Cummings models. These systematic studies shed light on the thermodynamic characterisation of open quantum systems, as well as on their numerical …
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Path integral methods for quantum dynamics in condensed phases
… points. These ideas have been validated on the spin boson model - a prototypical model to study condensed phase dynamics, which consists of a two-level system coupled to a harmonic bath. The new approach of building the reference propagators combined with their iterative evaluation and filtering …
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The multi Davydov-Ansatz
… the multi Davydov-Ansatz, an Ansatz of the bosonic many-body wave function in terms of moving Gaussian basis functions, to illuminate several aspects of open quantum system dynamics and quantum many-body theory. By two artifices alongside the time-dependent variational principle we extract …