Extended Hubbard model: Charge ordering and Wigner-Mott transition

• Autores: Amaricci, A.; Camjayi, Alberto; Haule, K.; Kotliar, G.; Tanasković, D.; Dobrosavljević, V.
• Año de publicación: 2010
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Extended; Hubbard; Wigner; Mott; Transition
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Strong correlations effects, which are often associated to the approach to a Mott insulating state, in some cases may be observed even far from half filling. This typically happens whenever the intersite Coulomb repulsion induces a tendency toward charge ordering, an effect that confines the electrons, and in turn favors local moment formation, i.e., Mott localization. A distinct intermediate regime then emerges as a precursor of such a Wigner-Mott transition, which is characterized by both charge and spin correlations, displaying large mass enhancements and strong renormalizations of other Fermi-liquid parameters. Here we present a careful study of a quarter-filled extended Hubbard model-a simple example where such physics can be studied in detail, and discuss its relevance for the understanding of the phenomenology of low-density two-dimensional electron gases. © 2010 The American Physical Society.
Fil: Amaricci, A.. Rutgers, The State University Of New Jersey;
Fil: Camjayi, Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Fil: Haule, K.. Rutgers, The State University Of New Jersey;
Fil: Kotliar, G.. Rutgers, The State University Of New Jersey;
Fil: Tanasković, D.. Institute Of Physics Belgrade; Serbia
Fil: Dobrosavljević, V.. National High Magnetic Field Laboratory; Estados Unidos