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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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Official URL: http://dx.doi.org/10.1209/epl/i2005-10321-x
Abstract
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.
Item Type: | Article |
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Additional Information: | © EDP Sciences |
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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