کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5358324 1503650 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption of alkali metal atoms on germanene: A first-principles study
ترجمه فارسی عنوان
جذب اتمهای فلز قلیایی بر روی آلمان: یک مطالعه اولیه
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
The structural, energetic and electronic properties of alkali metal (AM) atoms (including Li, Na and K) adsorbed germanene with a wide range of coverages are investigated by means of first-principles calculations. All AM atoms we considered prefer to bind on the hexagonal hollow site of germanene. In contrast to graphene, the interaction between adatom and germanene surface is quite strong due to its buckled hexagonal structure. As the increasing adatom coverage, the binding between AM atom and germanene sheet is weakened, due to the enhanced adatom-adatom repulsion while the decreased adatom-germanene attraction at high coverage. As a consequence of heavy charge transfer from AM to germanene, the formed adatom-Ge bonds perform mainly an ionic character. Through adsorption, the semimetallic germanene becomes to be metallic with its Dirac point moving below the Fermi level, thus making germanene behave as n-type doped. In addition, a small band gap can be opened at the Dirac point, and both the band gap and the concentration of charge carries of AM/germanene system can be tuned by controlling the adatom coverage. The strong binding of AM adatoms to germanene and the rich electronic properties of the AM/germanene systems suggest possible potential applications in germanene based field effect transistor (FET) devices.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 314, 30 September 2014, Pages 15-20
نویسندگان
, , , , , ,