Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: electron-electron interactions

Sortuj według:

Ogranicz wyniki do:

The effect of electron-electron interactions on the conditions of existence of a surface state

Kłos J.

Materials Science Poland

2007

Vol. 25, No. 2

497--504

Electronic surface states in one-dimensional two-band tight-binding approximation model are studied using the Green function method. The local density of states at successive atoms in a semi-infinite chain, even in the case of atoms distant from the surface, is found to be clearly different from that observed in an unperturbed (infinite) chain. The surface atom occupancy is calculated self-consistently, with the effect of electron-electron interactions taken into account. The electron-electron interactions are shown to have a significant impact on the conditions of existence of surface states.

Effects of Coulomb interactions in electron transport through short molecular chains

Kostyrko T., Bułka B. R.

Materials Science Poland

2004

Vol. 22, No. 4

497--506

Charge transport properties of short molecular chains connected to electrodes are studied using the non-equilibrium Green function method. The chains are described using a single-orbital Hubbard model. In the weak interaction range and low-temperature limit, the current flowing through the system was analysed within the Hartree-Fock approximation (HFA). It was found that for a weak coupling between the molecule and the leads I-V characteristics can be represented as a sequence of plateaus, alternating with regions of a finite slope. This finite slope in the I-V characteristics is related to the self-consistent molecular level being pinned down to the Fermi levels of the electrodes over a finite voltage regions. It is also related to a continuous change in the charge state of the molecule. In the strong repulsion limit, the HFA method is no longer credible and we resort to decoupling the equations of motion (EOM) for the Green functions of the chains, in order to treat all intrachain correlations and hopping exactly but to neglect some correlations between the molecule and the leads. A comparison of the results obtained with these two approaches for the same parameters allows us to make general observations concerning the role of correlations in transport through molecular junctions.

Rola nieporządku i oddziaływań w dwuwymiarowym gazie elektronowym w silnych polach magnetycznych

Tsui D.

Postępy Fizyki

1999

T. 50, z. 6

306-312