Temat: 75.25.Dk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stripe Phases in Layered Nickelates
Autorzy:: Rościszewski, K.
Oleś, A.
Powiązania:: https://bibliotekanauki.pl/articles/1426855.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.25.Dk
75.47.Lx
75.10.Lp
63.20.Pw
Opis:: To describe quasi two-dimensional nickelates we introduce an effective Hamiltonian for $e_{g}$ electrons, which includes the kinetic energy, on-site Coulomb interactions, spin-spin and Jahn-Teller (static) terms. The experimental stripe phases are correctly reproduced by the model. The mechanisms responsible for stripe formation are different than those reported in cuprates and manganites.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1048-1050
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: The Green Function Variational Approximation: Significance of Physical Constraints
Autorzy:: Bieniasz, K.
Berciu, M.
Oleś, A.
Powiązania:: https://bibliotekanauki.pl/articles/1398655.pdf
Data publikacji:: 2016-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.25.Dk
03.65.Ud
75.10.Lp
79.60.-i
Opis:: We present a calculation of the spectral properties of a single charge doped at a Cu(3d) site of the Cu-F plane in KCuF₃. The problem is treated by generating the equations of motion for the Green function by means of subsequent Dyson expansions and solving the resulting set of equations. This method, dubbed the variational approximation, is both very dependable and flexible, since it is a systematic expansion with precise control over elementary physical processes. It allows for deep insight into the underlying physics of polaron formation as well as for inclusion of many physical constraints, such as excluding crossing diagrams and double occupation constraint, which are not included in the self-consistent Born approximation. Here we examine the role and importance of such constraints by analyzing various spectral functions obtained in second order variational approximation.
Źródło:: Acta Physica Polonica A; 2016, 130, 2; 659-663
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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