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  Modern Statistical Mechanics
Posted on 2016-10-25 (Send to a Friend Send to a Friend )
Table of contents: Classical spin systems, order and disorder, introducing the Ising model and solving the 1d case, the transfer matrix, the Peierls argument; The quantum/classical correspondence, the Ising Hamiltonian; Quantum spin systems, su(2) symmetry; The 1 1 dimensional Ising model: the low- and high-temperature expansions, duality, solving it using free fermions; The XXZ chain and the six-vertex model; Landau theory and the mean-field approximation; A Conformal Field Theory Primer. . . . .
 
 
  Electronic Structure Theory
Posted on 2016-10-24 (Send to a Friend Send to a Friend )
The goal of electonic structure theory is to be predictive! Computational Electronic Structure Theory is an ever-growing field which combines theoretical physics and chemistry with computer science and math. . . . .
 
 
   What's (the) Matter?, A Show on Elementary Particle Physics.
Posted on 2016-10-17 (Send to a Friend Send to a Friend )
We present the screenplay of a physics show on particle physics, by the Physikshow of Bonn University. The show is addressed at non-physicists aged 14 and communicates basic concepts of elementary particle physics including the discovery of the Higgs boson in an entertaining fashion. It is also demonstrates a successful outreach activity heavily relying on the university physics students. This paper is addressed at anybody interested in particle physics and/or show physics. This paper is also addressed at fellow physicists working in outre . . . .
 
 
   The historical development of X-ray Absorption Fine Spectroscopy and of its applications to Materials Science
Posted on 2016-10-12 (Send to a Friend Send to a Friend )
This essay sketches the development of X-ray Absorption Fine Spectroscopy (XAFS) ever since the second half of 20th century. At that time, synchrotrons started competing with X-ray discharge tubes as the sources of the excitation able to show the pre- and near-edge structures (XANES) and extended oscillations (EXAFS) that characterize the X-ray absorption edge of solid matter. Actually, modern XAFS began after 1975, when the hard-X-ray synchrotron radiation derived from storage rings took over. Ever since, XAFS greatly contributed to both techn . . . .
 
 
   Dynamical Screening Effects in Correlated Electron Materials -- A Progress Report on Combined Many-Body Perturbation and DMFT
Posted on 2016-10-12 (Send to a Friend Send to a Friend )
We give a summary of recent progress in the field of electronic structure calculations for materials with strong electronic Coulomb correlations. The discussion focuses on developments beyond the by now well established combination of density functional and dynamical mean field theory dubbed "LDA DMFT". It is organized around the description of dynamical screening effects in the solid. Indeed, screening in the solid gives rise to dynamical local Coulomb interactions U(w) (Aryasetiawan et al 2004 Phys. Rev. B 70 195104), and this frequ . . . .
 
 
   Non-linear response in extended systems: a real-time approach
Posted on 2016-10-12 (Send to a Friend Send to a Friend )
In this thesis we present a new formalism to study linear and non-linear response in extended systems. Our approach is based on real-time solution of an effective Schr\"odinger equation. The coupling between electrons and external field is described by means of Modern Theory of Polarization. Correlation effects are derived from Green's function theory. We show that the inclusion of local-field effects and electron-hole interaction is crucial to predict and reproduce second and third harmonic generation in low dimensional structures, where . . . .
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