کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8154090 | 1524770 | 2018 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device
ترجمه فارسی عنوان
اسپین-سوپروایزر و اسپین فیلتر در یک دستگاه نقطه کوانتومی گرافن رومپیوانی
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
Spin-polarized transport through a rhombic graphene quantum dot (rGQD) attached to armchair graphene nanoribbon (AGNR) electrodes is investigated by means of the Green's function technique combined with single-band tight-binding (TB) approach including a Hubbard-like term. The Hubbard repulsion was included within the mean-field approximation. Compared to anti-ferromagnetic (AFM), we show that the ferromagnetic (FM) ordering of the rGQD corresponds to a smaller bandgap, thus resulting in an efficient spin injector. As a consequence, the electron transport spectrum reveals a spin valve effect, which is controlled by doping with B/N atoms creating a p-n-type junction. The calculations point out that such systems can be used as spin-filter devices with efficiency close to a 100%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 451, 1 April 2018, Pages 532-539
Journal: Journal of Magnetism and Magnetic Materials - Volume 451, 1 April 2018, Pages 532-539
نویسندگان
P.V. Silva, A. Saraiva-Souza, D.W. Maia, F.M. Souza, A.G. Souza Filho, V. Meunier, E.C. Girão,