Autor: Avella, A. - 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:: 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

Skocz do pozycji: 3.

Tytuł:: Interplay Between Spin-Orbit Coupling and Structural Deformations in Heavy Transition-Metal Oxides with Tetrahedral Coordination
Autorzy:: Forte, F.
Guerra, D.
Avella, A.
Autieri, C.
Romano, A.
Noce, C.
Powiązania:: https://bibliotekanauki.pl/articles/1030491.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.70.Ej
75.25.Dk
71.27.+a
Opis:: We analyze the effects of a large spin-orbit coupling on the magnetic state of a d¹ transition-metal ion located in a tetrahedral environment. While in the ideal tetrahedral symmetry the spin-orbit coupling acts only as a perturbation on the atomic energy levels set by the crystal-field splitting, we demonstrate that its effects are strongly enhanced in the case of distorted geometries. In particular, we consider the specific case in which the tetrahedron is compressed along the z direction, and show that, by increasing the degree of flattening, a large spin-orbit interaction (i) can induce a substantial anisotropic, unquenched orbital momentum and (ii) can affect the hierarchy of the lowest energy levels that are involved in the magnetic exchange.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 394-397
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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