دانلود مقاله ISI انگلیسی شماره 144492
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انتقال فلز مقره در یک نانولوله اختلال

عنوان انگلیسی
Metal-insulator transition in a disordered nanotube
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
144492 2017 8 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Chaos, Solitons & Fractals, Volume 99, June 2017, Pages 101-108

ترجمه کلمات کلیدی
نانوتوب اندرسون انتقال محلی، اتصال محکم، توزیع فاصله متوالی سطح، مولتی فرکتال، جریان الکتریکی،
کلمات کلیدی انگلیسی
Nanotube; Anderson localization transition; Tight-binding; Consecutive level spacing distribution; Multifractal; Electrical current;
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پیش نمایش مقاله  انتقال فلز مقره در یک نانولوله اختلال

چکیده انگلیسی

According to the Anderson localization theory, the wavefunctions of a sufficiently strong disordered system are localized. We show that shifting hopping energy between nearest neighbors would induce an anomalous localization-delocalization transition in a disordered square lattice nanotube modelled by tight-binding. For this purpose, the consecutive level spacing statistics and the singularity spectrum analyses were performed. The quantum analysis of singularity spectrum reveals distinctive multifractality structures of the wavefunctions associated with localized and delocalized phases. We find that while in finite-size limit the system has a sudden metal-insulator transition, in large-scale limit the system experiences a rapid but continuous crossover. Interestingly, we report a critical value of hopping energy for which the system behavior is fairly close to metallic phase and especially independent of the system size. Passing this critical value, a great difference in the electronic transport properties of the system occurs. It follows that in the large-scale size, the system tends to follow semi-metallic behavior, while in finite size behaves more like to an insulator. The localization-delocalization transition is also reflected in the electrical current. In accordance with the indicators studied, we find that in delocalized regime there is a spreading electrical current throughout the whole system with an azimuthal symmetric characteristic.