Understanding the electronic structure and magnetism of correlated nanosystems

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2009

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In this paper we review recent developments towards a realistic description of the electronic structure and magnetism of correlated nanosystems. A new class of so-called continuous-time solvers for the quantum impurity problem is discussed, which provides a numerically exact solution without systematic errors due to imaginary time discretization. These solvers are able to handle general interactions, like the full Coulomb vertex. We further show how four-point or higher-order correlation functions of the impurity problem can be computed. This allows the calculation of dynamical susceptibilities which provide information about spin excitations. Moreover, we discuss a principally new many-body scheme recently proposed for the description of non-local correlations in strongly correlated systems. This approach provides a basis for a many-body description of extended correlated nanostructures on a substrate. © 2009 IOP Publishing Ltd.

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Forschungsinformationssystem der UHH

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Quelldatensatz: oai:www.edit.fis.uni-hamburg.de:publications/a435cb5e-d98c-4223-b3f6-5e725def17bd