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C. Froese Fischer and D. Ellis
C. Froese Fischer and D. Ellis

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... spectra can be calculated and predicted. In this way, not only the interpretation of the experimental results is facilitated but also additional information, which is not available from experimental data, can be obtained. The topic of this work is therefore theoretical spectroscopy including the dev ...
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... The two parts of this thesis: “Dirac edge states in graphene” and “Majorana edge states in topological superconductors” may seem very loosely connected to the reader. To study the edges of graphene, a one-dimensional sheet of carbon, one needs to pay close attention to the graphene lattice and accur ...
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... a decaying state. If we assume for the moment that such a simple description of the time evolution is adequate (it very often is), a priori calculation of the real and imaginary parts of E~ allows prediction of the formation energies and lifetimes of intermediate species, and thus is an important ta ...
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Tight binding

In solid-state physics, the tight-binding model (or TB model) is an approach to the calculation of electronic band structure using an approximate set of wave functions based upon superposition of wave functions for isolated atoms located at each atomic site. The method is closely related to the LCAO method used in chemistry. Tight-binding models are applied to a wide variety of solids. The model gives good qualitative results in many cases and can be combined with other models that give better results where the tight-binding model fails. Though the tight-binding model is a one-electron model, the model also provides a basis for more advanced calculations like the calculation of surface states and application to various kinds of many-body problem and quasiparticle calculations.
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