تقرير
Electric Field Effects on Armchair MoS2 Nanoribbons
العنوان: | Electric Field Effects on Armchair MoS2 Nanoribbons |
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المؤلفون: | Dolui, Kapildeb, Pemmaraju, Chaitanya Das, Sanvito, Stefano |
المصدر: | ACS Nano, 2012, 6 (6), pp 4823-4834 |
سنة النشر: | 2013 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
الوصف: | {\it Ab initio} density functional theory calculations are performed to investigate the electronic structure of MoS$_2$ armchair nanoribbons in the presence of an external static electric field. Such nanoribbons, which are nonmagnetic and semiconducting, exhibit a set of weakly interacting edge states whose energy position determines the band-gap of the system. We show that, by applying an external transverse electric field, $E_\mathrm{ext}$, the nanoribbons band-gap can be significantly reduced, leading to a metal-insulator transition beyond a certain critical value. Moreover, the presence of a sufficiently high density of states at the Fermi level in the vicinity of the metal-insulator transition leads to the onset of Stoner ferromagnetism that can be modulated, and even extinguished, by $E_\mathrm{ext}$. In the case of bi-layer nanoribbons we further show that the band-gap can be changed from indirect to direct by applying a transverse field, an effect which might be of significance for opto-electronics applications. Comment: 12 pages, 15 figures |
نوع الوثيقة: | Working Paper |
DOI: | 10.1021/nn301505x |
URL الوصول: | http://arxiv.org/abs/1308.6229 |
رقم الأكسشن: | edsarx.1308.6229 |
قاعدة البيانات: | arXiv |
DOI: | 10.1021/nn301505x |
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