Hafermann, H and Brener, S and Rubtsov, A N and Katsnelson, M I and Lichtenstein, A I (2009) Understanding the electronic structure and magnetism of correlated nanosystems. Journal of Physics: Condensed Matter, 21 (6). 064248 (7pp).
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Official URL: http://stacks.iop.org/0953-8984/21/064248
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.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Aug 2009 09:14|
|Last Modified:||06 Aug 2009 11:31|
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