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We present the zero-temperature phase diagram of the one-dimensionalt2g-orbital Hubbard model, obtained using the density-matrix renormalizationgroup and Lanczos techniques. Emphasis is given to the case for the electrondensity n=5 corresponding to five electrons per site, of relevance for someCo-based compounds. However, several other cases for electron densities betweenn=3 and 6 are also studied. At n=5, our results indicate a first-ordertransition between a paramagnetic (PM) insulator phase and a fully-polarizedferromagnetic (FM) state by tuning the Hund's coupling. The results alsosuggest a transition from the n=5 PM insulator phase to a metallic regime bychanging the electron density, either via hole or electron doping. The behaviorof the spin, charge, and orbital correlation functions in the FM and PM statesare also described in the text and discussed. The robustness of these twostates varying parameters suggests that they may be of relevance in morerealistic higher dimensional systems as well.Comment: 9 pages, 8 figure

physical review. b, condensed matter and materials physics

Spin, charge, and orbital correlations in the one-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>t</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">g</mml:mi></mml:mrow></mml:msub></mml:math>-orbital Hubbard model

Spin, charge, and orbital correlations in the one-dimensionalt2g-orbital Hubbard model