تقرير
Electric Field Effects on Armchair MoS2 Nanoribbons
| العنوان: | Electric Field Effects on Armchair MoS2 Nanoribbons |
|---|---|
| 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 |
|---|