Spectral functions of one-dimensional systems with correlated disorder

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Khan, NA (Author) Other; Viana Parente Lopes, JMVP (Author) FCUP; Santos Pires, JPS (Author) Other; Lopes dos Santos, JMBL (Author) FCUP

Journal

Title: Journal of Physics Condensed Matter

Vol. 31

ISSN: 0953-8984

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-00Q-9KS

DOI: 10.1088/1361-648x/ab03ad

Abstract (EN): 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 O(N) 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, proportional to vertical bar k vertical bar(-alpha), we show that the spectral function is not self-averaging for alpha >= 1.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16