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Showing 1 to 14 of 14 for “"Bethe-Salpeter Equation"”.
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A model for pion-nucleon scattering based on the Bethe-Salpeter equation.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1968
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Improvement of the dielectric screening model in the Bethe-Salpeter equation approach: From static screening approximation to dynamical screening model
The student, Xiao Zhang, accepted the attached license on 2019-11-14 at 15:16.
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Perturbation theory of two particle bound states in QED for particles of spin ��� 1
In this paper we present a generalization of Salpeter's approach to solving the Bethe-Salpeter equation for the hydrogen atom to the case of any two particles of spin ≤ 1. In order to preserve the same general form of Salpeter's scheme the Kemmer-Duffin equations are used to describe the spin 1 or …
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Optical Response Of Finite And Extended Systems
… of jellium with and without a gap, using the Bethe-Salpeter equation. We only considered diagrams where the electron hole pair interact, via a statically screened Coulomb interaction, and we summed these diagrams to infinite order. First we coupled forward- and backward going electron-hole …
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Lorentz contraction effects in the electromagnetic form factors of relativistic two-body bound systems
… the two-body bound system is calculated from the Bethe-Salpeter equation and inserted into form factor expressions for scalar and vector photons. Even in the Breit frame, the charge density is distorted due to relativistic effects. The resulting form factor is compared to a static form factor …
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First principles calculations on ZnO non-equilibrium phase
… experimental band gap. Further, by solving the Bethe-Salpeter Equation, excitonic effect has been included and the exact optical spectrum for both structure has been obtained. We have found a large optical anisotropy for BN structure. Lastly we calculated the exciton binding energy for the BN …
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Tddft Derivative Couplings And Other Topics In Quantum Chemistry
… framework of Green's function. Detailed working equations are derived for the GW approximation, which is used to calculate the electron attachment/detachment energy, and the Bethe-Salpeter equation, which is used to obtain the electron excitation energies of a system.
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An equation for meson states in the quark model and its application to a meson bootstrap
"A differential equation for meson states is derived from the Bethe-Salpeter equation under the conditions of the quark model. The equation is shown to imply mass relations of the form K* 2 - P2 = K2 2 - 1£ • The equation is used to attempt bootstrap calculations of the vector and pseudo-scalar …
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Static and dynamic properties of the pion from continuum modelling of strong QCD
… for the quark propagator Schwinger-Dyson equation (SDE) and pseudoscalar meson Bethe-Salpeter equation (BSE) at and beyond the rainbow-ladder truncation level of this system of equations. We solve this coupled system of integral equations using a phenomenological model for the dressed …
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Field Theoretic Models of Deep Inelastic Lepton-Nucleon Scattering
… meson theory. 4. The leading part of the Bethe-Salpeter for the Compton amplitude in the neutral vector meson ladder model is closely related to Jackiw's Bethe-Salpeter equation for the electromagnetic vertex. (MT<sub>μ</sub><sup>μ</sup> which is the trace of the spin-averaged virtual …
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Ab initio modelling of photoinduced electron dynamics in nanostructures
… a dynamical, hybrid approach (the projected equations of motion (PEOM) method) where a composite material is split into subsystems which are then coupled electromagnetically. The primary system (e.g., the TMD) may be treated using any time- dependent theory, while the secondary system (e.g., …
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Computational investigation on polycyclic aromatic hydrocarbons in the molecular and solid phases
… theory calculations within the GW and Bethe-Salpeter equation for- malisms. In addition, for the crystal structures of PNT and HTP we perfomed DFT-based calculations using a pseudopotentials+plane- waves formalism and adopting the PBE exchange-correlation func- tional empirically …
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Exciton Dynamics and Anisotropy in 2D Metal Organochalcogenolate Semiconductors
… spectroscopy, combined with the GW plus Bethe-Salpeter equation calculations, we reveal multiple low-lying excitons with in-plane anisotropy in AgSePh and AgTePh. This showcases the richness of excitonic physics in these materials, which arises from their low-symmetry crystal structures. …
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Tunable Electronic Excitations in Hybrid Organic-Inorganic Materials: Ground-State and Many-Body Perturbation Approaches
… of the thesis, an all-electron implementation of Bethe-Salpeter equation (BSE) approach based on the $GW$ approximation is developed using numeric atom centered orbital basis sets, with the aim of developing first steps to a formal many-body theory treatment of neutral excitations, which goes …