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Showing 1 to 20 of 38 for “"one-particle"”.
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Numerical Treatment of Schrödinger’s Equation for One-Particle and Two-Particle Systems Using Matrix Method
… of atoms.</p> <p>The test cases include both one-particle and two-particle systems. The singularity poses an issue in the computation by affecting the accuracy of energies and wavefunctions obtained. Higher-order differences and non-uniform meshes are implemented to resolve the issue, but they …
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Hamiltonian Flow Equations and the Electron-Phonon-Problem
… In this continuous diagonalisation process the one particle energies and interaction constants are subject to a series of transformations, the ``flow'' of the Hamiltonian. They depend on a flow parameter l varying from zero to infinity. We give a proof that the asymptotic behaviour of the flow …
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Operator algebra perspectives on interacting quantum systems
… how to construct quantum many-body systems from one-particle systems. This problem has a well-established solution - namely, the second quantization (or the Gaussian functor). However, it seems difficult for the second quantization to go beyond generalized free field constructions without the …
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A quantum field theory for the interaction of pions and rhos
We extend the Kroll-Lee-Zumino model in its particle content to include the charged rho vector mesons and the neutral pion meson. This entailed using the larger SU(2) gauge group. The masses for the vector mesons were generated via spontaneous symmetry breaking using the Higgs mechanism. The …
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Dynamics of electrons and excitons in nanoclusters and molecules studied by many-body Green's function theory
… (PV) systems harvesting solar energy is one of the grand challenges for engineering and scientific researchers. The theoretical conversion limit of a single-junction solar cell is 31% according to Shockley and Queisser (SQ), which the most advanced single-junction PV devices are …
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Correlations in the one-dimensional Hubbard model
Correlation effects in the one-dimensional Hubbard model are studied by application of the L-resolvent method. The calculations are well beyond one-particle mean field approximation. All correlations involving two neighboring sites are included exactly and higher order correlations are …
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Ground state perturbation theory for the many electron system in a static lattice: some plasmon properties of insulators
… then treated as a perturbation or;. this system. One-particle basis functions, Bloch functions, are introduced explicitly into the perturbation series for the Green functions, and diagrams associated with the various terms are defined. Certain formal results in integral equation form are noted. …
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Quantum electrodynamic model for production amplitudes at infinite momentum
… the average number of pairs produced, the,two particle and one particle momentum distributions and the total cross section are obtainec1,. The two particle distribution is expressed in terms of the invariant, mass, total longitudinal momentum, and transverse momenta of the pair. The …
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Numerical investigation of highly inelastic reactions in a φ3 ladder model
… new type of data. We present many details of the one and two-particle spectra and the two-particle correlation function. Of special significance might be the transverse momentum dependence of the one-particle spectrum and the short range structure in the correlation function in the longitudinal …
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Cooperative Behavior in Driven Lattice Systems with Shifted Periodic Boundary Conditions
… boundary conditions. The systems consist of particle and holes which move by exchanges of nearest neighbor particle-hole pairs. These exchanges are controlled by the energetics associated with an internal Hamiltonian, an external drive and a stochastic coupling to a heat reservoir. The effect …
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Interplay of Electrical, Mechanical and Thermal Fields in III-N Nanostructures for LED Applications
… distribution, optical transition rates and one-particle electronic states using a 10-band sp<super>3</super>s<super>*</super> tight-binding framework; (2) to compute the effects of piezoelectric and pyroelectric polarization on the optical transition rates; (3) to model piezoelectricity in …
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Bosonization in 1 + 1/2 dimensions
… of freedom. As a byproduct, we calculate the one-particle Green's function and determine the effects of the boundaries on its analytic structure.
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TDDFT calculations for excitation spectra of solids and superstructures utilizing mGGA
… as understanding of physical properties of nanoparticles , inorganic semiconductors and semiconductor alloys. In this work, we start from the Kohn-Sham one-particle equation Schr¨odinger equation and solve it by expanding its eigenfunctions in terms of the linear augmented-slater-type …
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A study of the K[superscript -] + p [right arrow] K + N + [pi] reactions at 1.33 BeV/c
… events was used, with measurements being done on SMP's. These reactions are found to be dominated by K*(890)N production. Some evidence is also found for N*(1236)R and Yo*(1520)rr o production, and slight amounts of Yt(1660)rr and Y1*(1765)rr are seen. A backward peaking is seen to exist in …
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Discrete particle transport in porous media : discrete observations of physical mechanisms influencing particle behavior
An understanding of how discrete particles in the micron to submicron range behave in porous media is important to a number of environmental problems. Discrete particle behavior in the interior of a porous medium is complex and influenced by various physical and chemical factors. This work aimed to …
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Efficient coarse-grained brownian dynamics simulations for dna and lipid bilayer membrane with hydrodynamic interactions
… (CGMD) or Brownian dynamics (BD) simulation is a particle-based approach that has been applied to a wide range of biological problems that involve interactions with surrounding fluid molecules or the so-called hydrodynamic interactions (HIs). From simple biological systems such as a single DNA …
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Experimental constraints on exotic spin-dependent interactions using specialized materials
… proportional to (S.r) where S is the spin of one particle and r is the unit vector pointing from the first particle to the second. We use ensembles of polarized nuclei and the unpolarized low magnetic susceptibility masses along with NMR techniques to search for such a potential over sub-mm …
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Eigenvalues and low energy eigenvectors of quantum many-body systems
… Next, I discuss the eigenvalue distribution of one particle hopping random Schrbdinger operator in one dimension from free probability theory in context of the Anderson model. The second part is devoted to ground states and gap of QMBS. I first give the necessary background on frustration free …
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FROM DATA PRODUCTION TO SEARCH FOR GALACTIC COSMICRAY SOURCES WITH THE PIERRE AUGER OBSERVATORY
Astroparticle physics, at the crossroads of astrophysics and particle physics, investigates ultra-high-energy cosmic rays (UHECRs), the most energetic particles known in the Universe. Despite decades of research, their origins remain elusive. These particles are detected through extensive air …
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Dynamics of diatomic molecules in intense laser fields
… via an imaginary potential into the effective one-particle Hamiltonian. It is shown that the used form of the absorber potential is valid in many-electron time-dependent density functional theory calculations, i.e. that only ionized states are affected by the absorbing potential. The absorber …
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