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Publikováno v:
Phys. Rev. B 91, 085101 (2015)
Magnetic impurities embedded in a metal interact via an effective Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling mediated by the conduction electrons, which is commonly assumed to be long ranged, with an algebraic decay in the inter-impurity distance.
Externí odkaz:
http://arxiv.org/abs/1408.4037
A double quantum dot device, connected to two channels that only see each other through interdot Coulomb repulsion, is analyzed using the numerical renormalization group technique. By using a two-impurity Anderson model, and parameter values obtained
Externí odkaz:
http://arxiv.org/abs/1308.4746
Publikováno v:
Phys. Rev. B 88, 245113 (2013)
We present a completely unbiased and controlled numerical method to solve quantum impurity problems in d-dimensional lattices. This approach is based on a canonical transformation, of the Lanczos form, where the complete lattice Hamiltonian is exactl
Externí odkaz:
http://arxiv.org/abs/1307.8132
Autor:
Feiguin, A. E., Busser, C. A.
Publikováno v:
Phys. Rev. B 84, 115403 (2011)
We show how canonical transformations can map problems with impurities coupled to non-interacting rings onto a similar problem with open boundary conditions. The consequent reduction of entanglement, and the fact the density matrix renormalization gr
Externí odkaz:
http://arxiv.org/abs/1106.1464
Autor:
Busser, C. A., Vernek, E., Orellana, P., Lara, G. A., Kim, E. H., Feiguin, A. E., Anda, E. V., Martins, G. B.
In this work, we use three different numerical techniques to study the charge transport properties of a system in the two-level SU(2) (2LSU2) regime, obtained from an SU(4) model Hamiltonian by introducing orbital mixing of the degenerate orbitals vi
Externí odkaz:
http://arxiv.org/abs/1010.1580
Publikováno v:
Physical Review B 80, 035119 (2009)
Transport properties of an interacting triple quantum dot system coupled to three leads in a triangular geometry has been studied in the Kondo regime. Applying mean-field finite-U slave boson and embedded cluster approximations to the calculation of
Externí odkaz:
http://arxiv.org/abs/0902.2926
Autor:
da Silva, Luis G. G. V. Dias, Heidrich-Meisner, F., Feiguin, A. E., Busser, C. A., Martins, G. B., Anda, E. V., Dagotto, E.
Publikováno v:
Phys. Rev. B 78, 195317 (2008)
We apply the adaptive time-dependent Density Matrix Renormalization Group method (tDMRG) to the study of transport properties of quantum-dot systems connected to metallic leads. Finite-size effects make the usual tDMRG description of the Kondo regime
Externí odkaz:
http://arxiv.org/abs/0807.0581
Autor:
Anda, E. V., Chiappe, G., Busser, C. A., Davidovich, M. A., Martins, G. B., Heidrich-Meisner, F., Dagotto, E.
Publikováno v:
Phys. Rev. B 78, 085308 (2008)
This work proposes a new approach to study transport properties of highly correlated local structures. The method, dubbed the Logarithmic Discretization Embedded Cluster Approximation (LDECA), consists of diagonalizing a finite cluster containing the
Externí odkaz:
http://arxiv.org/abs/0805.2101
Autor:
Heidrich-Meisner, F., Martins, G. B., Busser, C. A., Al-Hassanieh, K. A., Feiguin, A. E., Chiappe, G., Anda, E. V., Dagotto, E.
Publikováno v:
Eur. Phys. J. B 67, 527 (2009)
The numerical analysis of strongly interacting nanostructures requires powerful techniques. Recently developed methods, such as the time-dependent density matrix renormalization group (tDMRG) approach or the embedded-cluster approximation (ECA), rely
Externí odkaz:
http://arxiv.org/abs/0705.1801