منابع مشابه
Mott transitions in two-orbital Hubbard systems
We investigate the Mott transitions in two-orbital Hubbard systems. Applying the dynamical mean field theory and the self-energy functional approach, we discuss the stability of itinerant quasi-particle states in each band. It is shown that separate Mott transitions occur at different Coulomb interaction strengths in general. On the other hand, if some special conditions are satisfied for the i...
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We investigate the Mott transitions in two-band Hubbard models with different bandwidths. Applying dynamical mean field theory, we discuss the stability of itinerant quasiparticle states in each band. We demonstrate that separate Mott transitions occur at different Coulomb interaction strengths in general, which merge to a single transition only under special conditions. This kind of behavior m...
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The present paper studies the symmetries of the Hubbard model of electrons with generally n-fold orbital degeneracy. It is shown that SUd(2n) and SUc(2n) symmetries hold, respectively, for the model with completely repulsive or attractive on-site interaction and that with partly attractive interactions. An extended Lieb– Mattis transformation is given to map these two symmetries into each other...
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Qinlong Luo,1,2 Dao-Xin Yao,3 Adriana Moreo,1,2 and Elbio Dagotto1,2 1Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996 USA 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 32831 USA 3State Key Lab of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, ...
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Electron correlations in the two-orbital Hubbard model at half-filling are investigated by combining dynamical mean field theory with the exact diagonalization method. We systematically study how the interplay of the intraand inter-band Coulomb interactions, together with the Hund coupling, affects the metal-insulator transition. It is found that if the intraand interband Coulomb interactions a...
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ژورنال
عنوان ژورنال: Journal of the Physical Society of Japan
سال: 2018
ISSN: 0031-9015,1347-4073
DOI: 10.7566/jpsj.87.034703