Zobrazeno 1 - 10
of 336
pro vyhledávání: '"Pruschke, T."'
Publikováno v:
Phys. Rev. B 95, 045130 (2017)
We apply the recently developed dual fermion algorithm for disordered interacting systems to the Anderson-Hubbard model. This algorithm is compared with dynamical cluster approximation calculations for a one-dimensional system to establish the qualit
Externí odkaz:
http://arxiv.org/abs/1604.08138
Publikováno v:
Phys. Rev. B 93, 054408 (2016)
Quantum antiferromagnets have proven to be some of the cleanest realizations available for theoretical, numerical, and experimental studies of quantum fluctuation effects. At finite temperatures, however, the additional effects of thermal fluctuation
Externí odkaz:
http://arxiv.org/abs/1511.01501
Publikováno v:
Phys. Rev. B 89, 195116 (2014)
We generalize the recently introduced dual fermion (DF) formalism for disordered fermion systems by including the effect of interactions. For an interacting disordered system the contributions to the full vertex function have to be separated into ela
Externí odkaz:
http://arxiv.org/abs/1310.6762
Publikováno v:
EPL 102 (2013) 37011
We use different numerical approaches to calculate the double occupancy and mag- netic susceptibility as a function of a bias voltage in an Anderson impurity model. Specifically, we compare results from the Matsubara-voltage quantum Monte-Carlo appro
Externí odkaz:
http://arxiv.org/abs/1302.0269
Publikováno v:
Phys. Rev. B 87, 075122 (2013)
In order to study the interplay between Kondo and Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, we calculate the spin-spin correlation functions between two Kondo impurities coupled to different sites of a half-filled open Hubbard chain. Using th
Externí odkaz:
http://arxiv.org/abs/1212.3963
Publikováno v:
In Journal of Algebra 1 May 2019 525:390-415
Publikováno v:
Phys. Rev. B 85 205119 (2012)
The density-matrix renormalization group (DMRG) algorithm can be adapted to the calculation of dynamical correlation functions in various ways which all represent compromises between computational efficiency and physical accuracy. In this paper we re
Externí odkaz:
http://arxiv.org/abs/1203.2523
Publikováno v:
J. Phys.: Conf. Ser. 391 (2012) 012156
We present Quantum Monte-Carlo simulations of an exchange-anisotropic spin-1/2 Heisenberg model on a square lattice with nearest and next-nearest neighbor interactions. The ground state phase diagram shows two classical magnetically ordered phases fo
Externí odkaz:
http://arxiv.org/abs/1110.3162
Publikováno v:
Phys. Rev. B 84, 155106 (2011)
We have designed a new multi-scale approach for Strongly Correlated Systems by combining the Dynamical Cluster Approximation (DCA) and the recently introduced dual-fermion formalism. This approach employs an exact mapping from a real lattice to a DCA
Externí odkaz:
http://arxiv.org/abs/1104.3854
Publikováno v:
Physical Review B volume 83 241408 (2011)
The effect of electronic interactions in graphene with vacancies or resonant scatterers is investigated. We apply dynamical mean-field theory in combination with quantum Monte Carlo simulations, which allow us to treat non-perturbatively quantum fluc
Externí odkaz:
http://arxiv.org/abs/1104.2207