Solid State Theory
of modern physics that have developed in the wake of the discovery of quantum mechanics. It deals with problems concerning the properties of materials and, more generally, systems with many degrees of freedom, ranging from fundamental questions to technological applications. This
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Introduction to String Theory - ETH Z
edu.itp.phys.ethz.chIntroduction to String Theory Chapter 0 ETH Zurich, HS13 Prof. N. Beisert, Dr. J. Br odel 22.12.2013 0 Overview String theory is an attempt to quantise gravity and unite it with the other fundamental forces of nature. It combines many interesting topics of (quantum) eld theory in two and higher dimensions.
Solid State Theory
edu.itp.phys.ethz.chLength: Bohr radius a B = ~2=me2 ˇ0:5 10 10m Energy: Hartree e2=a B = me4=~2 = mc2 2 ˇ27eV = 2Ry with the ne structure constant = e2=~c= 1=137.The energy scale of one Hartree is much less than the (relativistic) rest mass of an electron (˘0:5MeV), which in turn is considered small
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