Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Hewson, Alex C"'
Publikováno v:
Phys. Rev. B 93, 235115 (2016)
We analyze conditions for the observation of a low energy SU(4) fixed point in capacitively coupled quantum dots. One problem, due to dots with different couplings to their baths, has been considered by Tosi, Roura-Bas and Aligia (2015). They showed
Externí odkaz:
http://arxiv.org/abs/1603.05577
Autor:
Pandis, Vassilis, Hewson, Alex C.
Publikováno v:
Phys. Rev. B 92, 115131 (2015)
We study the renormalized perturbation theory of the single-impurity Anderson model, particularly the high-order terms in the expansion of the self-energy in powers of the renormalized coupling $\tilde{U}$. Though the presence of counter-terms in the
Externí odkaz:
http://arxiv.org/abs/1503.03718
Autor:
Pandis, Vassilis, Hewson, Alex C.
Publikováno v:
Phys. Rev. Lett. 115, 076401 (2015)
In the Renormalised Perturbation Theory (RPT) the Anderson impurity model is interpreted in terms of renormalised parameters $\boldsymbol{\tilde{\mu}}= (\tilde{\epsilon}_d, \tilde{\Delta}, \tilde{U})$ which are in a one-to-one correspondence with the
Externí odkaz:
http://arxiv.org/abs/1412.5631
Publikováno v:
Phys. Rev. B 88, 245130 (2013)
We examine the low energy behavior of a double quantum dot in a regime where spin and pseudospin excitations are degenerate. The individual quantum dots are described by Anderson impurity models with an on-site interaction $U$ which are capacitively
Externí odkaz:
http://arxiv.org/abs/1309.1715
We apply the recently developed extremely correlated Fermi liquid theory to the Anderson impurity model, in the extreme correlation limit. We develop an expansion in a parameter \lambda, related to n_d, the average occupation of the localized orbital
Externí odkaz:
http://arxiv.org/abs/1307.3492
Publikováno v:
Phys. Rev. Lett. 108, 266401 (2012)
We study non-equilibrium current fluctuations through a quantum dot, which includes a ferromagnetic Hund's rule coupling $J$, in the low-energy Fermi liquid regime using the renormalized perturbation theory. The resulting cumulant for the current dis
Externí odkaz:
http://arxiv.org/abs/1201.1957
Autor:
Edwards, Khan, Hewson, Alex C
Publikováno v:
Journal of Physics: Condens. Matter 23 (2011) 045601
The anomalous low energy behaviour observed in metals with strong electron correlation, such as in the heavy fermion materials, is believed to arise from the scattering of the itinerant electrons with low energy spin fluctuations. In systems with mag
Externí odkaz:
http://arxiv.org/abs/1101.2840
Autor:
Bauer, Johannes, Hewson, Alex C.
Publikováno v:
Phys. stat. sol. 247 (2010), 638
We explore the quantum phase transitions between two ordered states in the infinite dimensional Hubbard-Holstein model at half filling. Our study is based on the dynamical mean field theory (DMFT) combined with the numerical renormalization group (NR
Externí odkaz:
http://arxiv.org/abs/1007.5011
We explore the predictions of the renormalized perturbation theory for an n-channel Anderson model, both with and without Hund's rule coupling, in the regime away from particle-hole symmetry. For the model with n=2 we deduce the renormalized paramete
Externí odkaz:
http://arxiv.org/abs/1007.4175