Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Alex C. Hewson"'
Autor:
Alex C. Hewson, Akira Oguri
Publikováno v:
Physical Review B. 97
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dadd069459c09ee89bc5456f69bc7f19
https://doi.org/10.1103/physrevb.97.199902
https://doi.org/10.1103/physrevb.97.199902
The Luttinger Theorem, which relates the electron density to the volume of the Fermi surface in an itinerant electron system, is taken to be one of the essential features of a Fermi liquid. The microscopic derivation of this result depends on the van
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::858fca22035b223825f2ccb076076921
http://arxiv.org/abs/1703.01807
http://arxiv.org/abs/1703.01807
Autor:
Alex C. Hewson, Akira Oguri
We study the higher-order Fermi-liquid relations of Kondo systems for arbitrary impurity-electron fillings, extending the many-body quantum theoretical approach of Yamada-Yosida. It includes partly a microscopic clarification of the related achieveme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17cae3f376e945f7dddf1dcdb308d920
We show that when there is a sudden transition from a small to a large Fermi surface at a field-induced quantum critical point, similar to what may have been observed in some heavy-fermion compounds, an additional term has to be taken into account in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23ce10c05fa674b0f4725a6f5a74df39
Autor:
Alex C. Hewson, Akira Oguri
We study the low-energy behavior of the vertex function of a single Anderson impurity away from half-filling for finite magnetic fields, using the Ward identities with careful consideration of the anti-symmetry and analytic properties. The asymptotic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e57578ca8aad236be07094576725eb1
Renormalized parameters and perturbation theory in dynamical mean-field theory for the Hubbard model
Autor:
Alex C. Hewson
Publikováno v:
Physical Review B. 94
We calculate the renormalized parameters for the quasiparticles and their interactions for the Hubbard model in the paramagnetic phase as deduced from the low energy Fermi liquid fixed point using the results of a numerical renormalization group calc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f85f1a3c82b3238b6e40d6e6ad8fa6e
https://doi.org/10.1103/physrevb.94.195152
https://doi.org/10.1103/physrevb.94.195152
Publikováno v:
Physical Review B. 93
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f101affcea8705943513d0a80462945
https://doi.org/10.1103/physrevb.93.235115
https://doi.org/10.1103/physrevb.93.235115
Autor:
Johannes Bauer, Alex C. Hewson
Publikováno v:
The European Physical Journal B. 57:235-249
We analyze the properties of the quasiparticle excitations of metallic antiferromagnetic states in a strongly correlated electron system. The study is based on dynamical mean field theory (DMFT) for the infinite dimensional Hubbard model with antifer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ff172b544a340ea4efe8f051eef693f
https://doi.org/10.1140/epjb/e2007-00175-6
https://doi.org/10.1140/epjb/e2007-00175-6
Autor:
Alex C. Hewson, Vassilis Pandis
Publikováno v:
Physical Review B. 92
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::343816d5ec29a036869dced4dd0254e4
https://doi.org/10.1103/physrevb.92.115131
https://doi.org/10.1103/physrevb.92.115131
Autor:
Alex C. Hewson, Vassilis Pandis
Publikováno v:
Physical Review Letters. 115
The low temperature behavior of a Fermi liquid can be described in terms of quasiparticle excitations that are in 1-1 correspondence with those of the noninteracting system. Because of adiabatic continuity, the Landau parameters, which describe the i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb88e2bbabba591f92862878b9aae938
https://doi.org/10.1103/physrevlett.115.076401
https://doi.org/10.1103/physrevlett.115.076401