Anomalous optical absorption in a random system with scale-free disorder



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Díaz García, Elena and Rodriguez, A. and Domínguez-Adame Acosta, Francisco and Malyshev, Andrey (2005) Anomalous optical absorption in a random system with scale-free disorder. Europhysics Letters, 72 (6). pp. 1018-1024. ISSN 0295-5075

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Optical spectroscopy usually fails in detecting localization-delocalization (Anderson) transitions. We report on an anomalous behavior of the absorption spectrum in a one-dimensional lattice with long-range correlated diagonal disorder, having a power-like spectrum S(k)similar to 1/k(alpha). This type of correlations gives rise to a phase of extended states at the band center, provided alpha is larger than a critical value alpha(c). We show that for alpha<alpha(c), the absorption spectrum is single-peaked, while an additional peak arises when alpha>alpha(c), signaling the occurrence of the Anderson transition. The peak is located slightly below the low-energy mobility edge, providing a unique spectroscopic tool to monitor the latter. We present qualitative arguments explaining this anomaly.

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© EDP Sciences
The authors thank A. V. Malyshev, M. L. Lyra and F. A. B. F. de Moura for helpful comments. This work was supported by DGI-MCyT (Project MAT2003-01533) and CAM (Project GR/MAT/0039/2004). V. A. M. acknowledges support from ISTC (grant #2679).

Uncontrolled Keywords:Metal-Insulator-Transition, Correlated disorder, Mobility edge, Localization, Absence, Diffusion, Transport, Chains, Models, States
Subjects:Sciences > Physics > Materials
ID Code:27405
Deposited On:17 Feb 2015 08:29
Last Modified:17 May 2016 15:04

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