Electron spectral density of the half-filled Hubbard model in the atomic limit at finite temperature

• Autorzy: Sergei Ovchinnikov , Elena Shneyder
• Języki publikacji: EN

Abstrakty

EN

We have calculated the spectral function and density of states of halffilled two-dimensional Hubbard model in the Hubbard-I approximation assuming an antiferromagnetic long range order at low temperature and compared results to the QMC data. It occurs that calculated functions are in a qualitative agreement with the QMC one. We have also shown that Neel ordered state dispersion has the similar form to the spin density wave one.

Słowa kluczowe

EN

Hubbard model   half-filling   spectral function   density of states   redistribution of spectral weight   71.10.Fd  

• Czasopismo: Open Physics
• Rocznik: 2003
• Tom: 1
• Numer: 3
• Strony: 421-431

Daty

wydano

2003-09-01

online

2003-09-01

Twórcy

autor

Sergei Ovchinnikov

• L. V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Science, Akademgorodok, 660036, Krasnoyarsk, Russia

autor

Elena Shneyder

• L. V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Science, Akademgorodok, 660036, Krasnoyarsk, Russia,

Bibliografia

• [1] J.C. Hubbard: “Electron correlations in narrow energy bands”, Proc. Roy. Soc. London, Vol. A 276, (1963), pp. 238. http://dx.doi.org/10.1098/rspa.1963.0204[Crossref]
• [2] P.O. Zaitsev: “Diagram technique and gas approximation in the Hubbard model”, JETP, Vol. 70, (1976), pp. 1100.
• [3] V.V. Val'kov and S.G. Ovchinnikov: Quasiparticles in strongly correlated systems, Siberian Branch of Russian Academy of science, Novosibirsk, 2001.
• [4] C. Grober, R. Eder, W. Hanke: “Anomalous low-doping phase of the Hubbard model”, Phys. Rev.B, Vol. 62, (2000), pp. 4336. http://dx.doi.org/10.1103/PhysRevB.62.4336[Crossref]
• [5] D.N. Zubarev, “Two-time temperature dependent Green function method in the statistic thermodynamics”, Usp. Fiz. Nauk, Vol. 71, (1960), pp. 71.
• [6] J.C. Hubbard: “Electron correlations in narrow bands. An improved solution”, Proc. Roy. Soc., Vol. A 277, (1964), pp. 237.
• [7] C. Castellany, C. Di Castro, D. Feinberg, J. Ranniger: “New model hamiltonian for the metal-insulator transition”, Phys. Rev. Let., Vol. 26, (1979), pp. 1957. http://dx.doi.org/10.1103/PhysRevLett.43.1957[Crossref]
• [8] N. Bulut, D. J. Scalapino, S.R. White: “Electronic Properties of the Insulating Half-Filled Hubbard Model”, Phys. Rev. Let., Vol. 73, (1994), pp. 748. http://dx.doi.org/10.1103/PhysRevLett.73.748[Crossref]

Identyfikatory

DOI

10.2478/BF02475853