Abstract

We analyze the single-particle and collective excitations near the metal to charge-transfer insulator transition, using the slave-boson technique. We show that the Mott transition can be interpreted as a softening of an auxiliary Bose excitation. In the insulating phase the energy of the boson at zero momentum is related to the jump in the chemical potential at zero doping. The dispersion of the collective modes gives rise to the structure of the incoherent Hubbard bands. A similar picture holds for the single-band Hubbard model.

Keywords

PhysicsCondensed matter physicsQuasiparticleHubbard modelBosonMott insulatorMetal–insulator transitionExcitationFermi Gamma-ray Space TelescopeQuantum mechanicsSuperconductivityElectrical resistivity and conductivity

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Mean-field phase diagram of a two-band<i>t</i>-<i>J</i>model for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>layers

C. Castellani , M. Grilli , Gabriel Kotliar

We study the mean-field phase diagram of a two-band t-J model. Upon varying the doping and the values of the parameters, we identify solutions with different magnetic structure ...

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Publication Info

Year
1992
Type
article
Volume
69
Issue
13
Pages
2009-2012
Citations
48
Access
Closed

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C. Castellani, Gabriel Kotliar, Roberto Raimondi et al. (1992). Collective excitations, photoemission spectra, and optical gaps in strongly correlated Fermi systems. Physical Review Letters , 69 (13) , 2009-2012. https://doi.org/10.1103/physrevlett.69.2009

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DOI
10.1103/physrevlett.69.2009