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Dirac Fermions in Solids  from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals 
Posted on 20140720
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Understanding Diraclike Fermions has become an imperative in modern condensed matter sciences: all across its research frontier, from graphene to high Tc superconductors to the topological insulators and beyond, various electronic systems exhibit properties which can be well described by the Dirac equation. Such physics is no longer the exclusive domain of quantum field theories and other esoteric mathematical musings; instead, real physics of real systems is governed by such equations, and important materials science and practical imp . . . . 






Dirac materials 
Posted on 20140719
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A wide range of materials, like dwave superconductors, graphene, and topological insulators, share a fundamental similarity: their lowenergy fermionic excitations behave as massless Dirac particles rather than fermions obeying the usual Schrodinger Hamiltonian. This emergent behavior of Dirac fermions in condensed matter systems defines the unifying framework for a class of materials we call "Dirac materials''. In order to establish this class of materials, we illustrate how Dirac fermions emerge in multiple entirely different condensed . . . . 






Renormalization for Philosophers 
Posted on 20140628
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We have two aims. The main one is to expound the idea of renormalization in quantum field theory, with no technical prerequisites (Sections 2 and 3). Our motivation is that renormalization is undoubtedly one of the great ideas, and great successes, of twentiethcentury physics. Also it has strongly influenced in diverse ways, how physicists conceive of physical theories. So it is of considerable philosophical interest. Second, we will briefly relate renormalization to Ernest Nagel's account of intertheoretic relations, especially reduction (Se . . . . 






Title: Lecture Script: Introduction to Computational Quantum Mechanics 
Posted on 20140627
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This document is the lecture script of a onesemester course taught at the University of Basel in the Fall semesters of 2012 and 2013. It is aimed at advanced students of physics who are familiar with the concepts and notations of quantum mechanics.
Quantum mechanics lectures can often be separated into two classes. In the first class you get to know Schroedinger's equation and find the form and dynamics of simple physical systems (square well, harmonic oscillator, hydrogen atom); most calculations are analytic and inspired by calculations ori . . . . 






Title: Physics and Financial Economics (17762014): Puzzles, Ising and AgentBased models 
Posted on 20140626
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This short review presents a selected history of the mutual fertilization between physics and economics, from Isaac Newton and Adam Smith to the present. The fundamentally different perspectives embraced in theories developed in financial economics compared with physics are dissected with the examples of the volatility smile and of the excess volatility puzzle. The role of the Ising model of phase transitions to model social and financial systems is reviewed, with the concepts of random utilities and the logit model as the analog of the Boltzma . . . . 






Introduction to Relativistic Transport Theory 
Posted on 20140625
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The present manuscript are lecture notes on an introduction to relativistic transport theory, held at the
SERC School on Modern Theories of Nuclear Reactions in Roorkee, India.
The aim of these lectures is to provide a selfcontained presentation of the general foundations of rela
tivistic transport theory with the aim to provide the theoretical tools for the application of such meth
ods to relativistic heavyion collisions. Here, the main challenge lies in the fact that one has to de
scribe
strongly coupled systems
of hadrons that mo . . . . 






