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Abstract:

We study the ground-state phase diagram of the Anderson-Hubbard model with correlated hopping at half-filling in one dimension. The Hamiltonian has a local Coulomb repulsion U and a disorder potential with local energies randomly distributed in the interval (-W,+W) with equal probability, acting on the singly occupied sites. The hopping process which modifies the number of doubly occupied sites is forbidden. The hopping between nearest-neighbor singly occupied and empty sites or between singly occupied and doubly occupied sites has the same amplitude t. We identify three different phases as functions of the disorder amplitude W and Coulomb interaction strength U>0. When U<4t the system shows a metallic phase: (i) only when no disorder is present W=0 or an Anderson-localized phase, (ii) when disorder is introduced W≠0. When U>4t the Anderson-localized phase survives as long as disorder effects dominate on the interaction effects, otherwise a Mott-insulator phase (iii) arises. Phases (i) and (ii) are characterized by a finite density of doublons and a vanishing charge gap among the ground state and the excited states. Phase (iii) is characterized by the vanishing density of doublons and a finite gap for the charge excitations. © 2017 American Physical Society.

Registro:

Documento: Artículo
Título:Anderson-Mott transition in a disordered Hubbard chain with correlated hopping
Autor:Battista, F.; Camjayi, A.; Arrachea, L.
Filiación:Departamento de Física, FCEyN, Universidad de Buenos Aires, IFIBA, Pabellón i, Ciudad Universitaria, CABA, 1428, Argentina
International Center for Advanced Studies, ECyT-UNSAM, Campus Miguelete, 25 de Mayo y Francia, Buenos Aires, 1650, Argentina
Año:2017
Volumen:96
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevB.96.045413
Título revista:Physical Review B
Título revista abreviado:Phys. Rev. B
ISSN:24699950
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699950_v96_n4_p_Battista

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Citas:

---------- APA ----------
Battista, F., Camjayi, A. & Arrachea, L. (2017) . Anderson-Mott transition in a disordered Hubbard chain with correlated hopping. Physical Review B, 96(4).
http://dx.doi.org/10.1103/PhysRevB.96.045413
---------- CHICAGO ----------
Battista, F., Camjayi, A., Arrachea, L. "Anderson-Mott transition in a disordered Hubbard chain with correlated hopping" . Physical Review B 96, no. 4 (2017).
http://dx.doi.org/10.1103/PhysRevB.96.045413
---------- MLA ----------
Battista, F., Camjayi, A., Arrachea, L. "Anderson-Mott transition in a disordered Hubbard chain with correlated hopping" . Physical Review B, vol. 96, no. 4, 2017.
http://dx.doi.org/10.1103/PhysRevB.96.045413
---------- VANCOUVER ----------
Battista, F., Camjayi, A., Arrachea, L. Anderson-Mott transition in a disordered Hubbard chain with correlated hopping. Phys. Rev. B. 2017;96(4).
http://dx.doi.org/10.1103/PhysRevB.96.045413