Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Hettler, M."'
Publikováno v:
Phys. Rev. Lett. 103, 156803 (2009)
We predict a new electron pair-tunneling (PT) resonance in non-linear transport through quantum dots with positive charging energies exceeding the broadening due to thermal and quantum fluctuations. The PT resonance shows up in the single-electron tr
Externí odkaz:
http://arxiv.org/abs/0903.3559
Publikováno v:
Appl.Phys.Lett. 89, 052101 (2006)
We study charge transport through a chain of quantum dots. The dots are fully coherent among each other and weakly coupled to metallic electrodes via the dots at the interface, thus modelling a molecular wire. If the non-local Coulomb interactions do
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505345
Publikováno v:
PRL 95, 146806 (2005)
We derive general expressions for the current and shot noise, taking into account non-Markovian memory effects. In generalization of previous approaches our theory is valid for arbitrary Coulomb interaction and coupling strength and is applicable to
Externí odkaz:
http://arxiv.org/abs/cond-mat/0501534
Publikováno v:
PRB 71, 045341 (2005)
We consider charge transport through a nanoscopic object, e.g. single molecules, short nanotubes, or quantum dots, that is weakly coupled to metallic electrodes. We account for several levels of the molecule/quantum dot with level-dependent coupling
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406647
Quantum cluster approaches offer new perspectives to study the complexities of macroscopic correlated fermion systems. These approaches can be understood as generalized mean-field theories. Quantum cluster approaches are non-perturbative and are alwa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404055
Publikováno v:
Physical. Review. B 67, 085101 (2003)
We employ the Dynamical Cluster Approximation (DCA) in conjunction with the Fluctuation Exchange Approximation (FLEX) to study the Hubbard model. The DCA is a technique to systematically restore the momentum conservation at the internal vertices of F
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209170
We investigate the electrical transport through a system of benzene coupled to metal electrodes by electron tunneling. Using electronic structure calculations, a semi--quantitative model for the pi-electrons of the benzene is derived that includes ge
Externí odkaz:
http://arxiv.org/abs/cond-mat/0207483
Publikováno v:
Physical. Review. B 65, 153102 (2002)
We examine a central approximation of the recently introduced Dynamical Cluster Approximation (DCA) by example of the Hubbard model. By both analytical and numerical means we study non-compact and compact contributions to the thermodynamic potential.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0201186
The Dynamical Cluster Approximation (DCA) is used to study non-local corrections to the dynamical mean field phase diagram of the two-dimensional Hubbard model. Regions of antiferromagnetic, d-wave superconducting, pseudo-gapped non-Fermi liquid, and
Externí odkaz:
http://arxiv.org/abs/cond-mat/0011282
We recently introduced the dynamical cluster approximation(DCA), a new technique that includes short-ranged dynamical correlations in addition to the local dynamics of the dynamical mean field approximation while preserving causality. The technique i
Externí odkaz:
http://arxiv.org/abs/cond-mat/9903273