Autor: Mancini, F. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Anomalous Self-Energy Features in the 2D Hubbard Model
Autorzy:: Avella, A.
Mancini, F.
Powiązania:: https://bibliotekanauki.pl/articles/1813757.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.Fd
71.27.+a
71.10.-w
Opis:: The electronic self-energy of the two-dimensional Hubbard model, computed in the non-crossing approximation within the composite operator method, is studied as a function of frequency as well as temperature at the Fermi surface, for a value of doping at which the pseudogap is already well developed. For values of momentum belonging to the phantom arc of the Fermi surface, both dependences show anomalous power law behavior in contrast to that expected from the Fermi liquid theory.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 395-398
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Study of the Mott Transition in the Three-Dimensional Hubbard Model
Autorzy:: Mancini, F.
Turkowski, V.
Powiązania:: https://bibliotekanauki.pl/articles/2030509.pdf
Data publikacji:: 2002-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
71.10.Fd
71.30.+h
Opis:: The Mott-Hubbard transition in the three-dimensional Hubbard model is studied by means of the composite operator method. Analytical and numerical calculations show the existence of a critical value U$\text{}_{c}$ of the Coulomb interaction which separates paramagnetic insulating and metallic phases. In the composite operator method the ratio U$\text{}_{c}$/W, where W is the band width, has the same value as in the two-dimensional case. The ground state of the Mott insulator is characterized by a local antiferromagnetic order where the electrons keep some mobility, but this latter must be compatible with the local ordering. By analyzing the intersite hopping it is possible to establish that some correlation functions behave as order parameters in the insulating phase.
Źródło:: Acta Physica Polonica A; 2002, 101, 4; 505-523
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Entanglement Properties and Phase Diagram of the Two-Orbital Atomic Hubbard Model
Autorzy:: Avella, A.
Mancini, F.
Scelza, G.
Chaturvedi, S.
Powiązania:: https://bibliotekanauki.pl/articles/1813770.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.10.-w
71.10.Fd
71.27.+a
Opis:: We study the two-orbital Hubbard model in the limit of vanishing kinetic energy. The phase diagram in the V-J plane, with V and J denoting the interorbital hybridization and exchange coupling respectively, at half filling is obtained. A singlet(dimer)-triplet transition is found for a critical value of the ratio V/J. The entropy of formation, both in the mode and in the particle pictures, presents a jump at the same critical line in conformity with the suggested relation between criticality and entanglement.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 417-420
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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