Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Schäfer, Steffen"'
Autor:
Makhfudz, Imam, Cherkasskii, Mikhail, Lombardo, Pierre, Schäfer, Steffen, Kusminskiy, Silvia Viola, Hayn, Roland
Inspired by the discovery of metal-organic frameworks, the possibility of quantum anomalous Hall effect (QAHE) in two-dimensional kagome systems with $d$-orbital electrons is studied within a multi-orbital tight-binding model. In the absence of excha
Externí odkaz:
http://arxiv.org/abs/2402.05845
Autor:
Shaiek, Nesrine, Denawi, Hassan, Koudia, Mathieu, Hayn, Roland, Schäfer, Steffen, Berbezier, Isabelle, Lamine, Chokri, Siri, Olivier, Akremi, Abdelwaheb, Abel, Mathieu
We report on the successful on-surface synthesis of metal-organic covalent coordination networks with a dense Kagome lattice of metallic centers. In the case of Mn centers ab-initio calculations show that the adsorbed monolayer on Ag(111) has all the
Externí odkaz:
http://arxiv.org/abs/2202.04867
We propose a nanoscale device consisting of a double quantum dot with strong intra- and inter- dot Coulomb repulsions. In this design, the current can only flow through the lower dot, but is triggered by the gate-controlled occupancy of the upper dot
Externí odkaz:
http://arxiv.org/abs/2101.02060
Autor:
Schäfer, Steffen
La RPA Self-Consistante (SCRPA) est appliquée aux fonctions de corrélation particule-trou dans le Modèle de Hubbard.Pour une fonction de Green générale à $n$ corps cette méthode se dérive à partir de l'Equation de Dyson où seules sont reten
Externí odkaz:
http://tel.archives-ouvertes.fr/tel-00002990
http://tel.archives-ouvertes.fr/docs/00/04/54/14/PDF/tel-00002990.pdf
http://tel.archives-ouvertes.fr/docs/00/04/54/14/PDF/tel-00002990.pdf
Autor:
Weber, Thomas, Sossenheimer, Johannes, Schäfer, Steffen, Ott, Moritz, Walther, Jessica, Abele, Eberhard
Publikováno v:
In Procedia CIRP 2019 80:683-688
Autor:
Schäfer, Steffen
Publikováno v:
Phys. Rev. B 83, 195110 (2011)
A particle-hole symmetric Anderson impurity model with a metallic host of narrow bandwidth is studied within the framework of the local moment approach. The resultant single-particle spectra are compared to unrestricted Hartree-Fock, second order per
Externí odkaz:
http://arxiv.org/abs/1105.1983
Publikováno v:
Eur. Phys. J. B 43, 81-92 (2005)
The electrical and optical properties of ordered passive arrays, constituted of inductive and capacitive components, are usually deduced from Kirchhoff's rules. Under the assumption of periodic boundary conditions, comparable results may be obtained
Externí odkaz:
http://arxiv.org/abs/cond-mat/0501137
Publikováno v:
Eur. Phys. J B 31, 355-364 (2003)
Binary disordered systems are usually obtained by mixing two ingredients in variable proportions: conductor and insulator, or conductor and super-conductor. and are naturally modeled by regular bi-dimensional or tri-dimensional lattices, on which sit
Externí odkaz:
http://arxiv.org/abs/cond-mat/0412061
Autor:
Schäfer, Steffen, Logan, David E
Publikováno v:
Phys. Rev. B 63, 45122 (2001)
We consider single-particle spectra of a symmetric narrow-band Anderson impurity model, where the host bandwidth $D$ is small compared to the hybridization strength $\Delta_{0}$. Simple 2nd order perturbation theory (2PT) in $U$ is found to produce a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0011216
Autor:
Schäfer, Steffen, Schuck, Peter
Publikováno v:
Phys. Rev. B 59, 1712-1733 (1999)
An approach for particle-hole correlation functions, based on the so-called SCRPA, is developed. This leads to a fully self-consistent RPA-like theory which satisfies the $f$-sum rule and several other theorems. As a first step, a simpler self-consis
Externí odkaz:
http://arxiv.org/abs/cond-mat/9804011