Unconventional localization phenomena in a spatially non-uniform disordered material

A completely opposite behavior of electronic localization is revealed in a spatially non-uniform disordered material compared to the traditional spatially uniform disordered one. This fact is substantiated by considering an order-disorder separated (ODS) nanotube and studying the response of non-int...

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Bibliographic Details
Published in:arXiv.org 2018-09
Main Authors: Banerjee, Madhuparna, Baisakhi Mal, Maiti, Santanu K
Format: Article
Language:English
Subjects:
Eigenvectors
Energy spectra
Localization
Magnetic flux
Order disorder
Weight
Online Access:Get full text
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Summary:A completely opposite behavior of electronic localization is revealed in a spatially non-uniform disordered material compared to the traditional spatially uniform disordered one. This fact is substantiated by considering an order-disorder separated (ODS) nanotube and studying the response of non-interacting electrons in presence of magnetic flux. We critically examine the behavior of flux induced energy spectra and circular current for different band fillings, and it is observed that maximum current amplitude (MCA) gradually decreases with disorder strength for weak disorder regime, while surprisingly it (MCA) increases in the limit of strong disorder suppressing the effect of disorder, resulting higher conductivity. This is further confirmed by investigating Drude weight and exactly same anomalous feature is noticed. It clearly gives a hint that localization-to-delocalization transition (LTD) is expected upon the variation of disorder strength which is justified by analyzing the nature of different eigenstates. Our analysis may give some significant inputs in analyzing conducting properties of different doped materials.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.06630