Spectral functions of one-dimensional systems with correlated disorder. (28th February 2019)

• Record Type: Journal Article
• Authors: Khan, N A; Viana Parente Lopes, J M; Santos Pires, J P; Lopes dos Santos, J M B
• Is Part Of: Journal of physics. Volume 31:Number 17(2019)
• Publication Date: 2019-02-28
• Subjects: disordered systems -- correlated disorder -- electronic spectral function -- Kernel polynomial method -- classical limit of the propagator -- non self-averaging behavior -- non-perturbative calculations; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ab03ad
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We investigate the spectral function of Bloch states in a one-dimensional tight-binding non-interacting chain with two different models of static correlated disorder, at zero temperature. We report numerical calculations of the single-particle spectral function based on the Kernel polynomial method, which has an computational complexity. These results are then confirmed by analytical calculations, where precise conditions were obtained for the appearance of a classical limit in a single-band lattice system. Spatial correlations in the disordered potential give rise to non-perturbative spectral functions shaped as the probability distribution of the random on-site energies, even at low disorder strengths. In the case of disordered potentials with an algebraic power-spectrum, , we show that the spectral function is not self-averaging for .