کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5496946 | 1399876 | 2017 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nanoscale capacitance: A quantum tight-binding model
ترجمه فارسی عنوان
ظرفیت نانومقیاس: مدل کوانتومی تنگ اتصال
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کلمات کلیدی
خازن نانومقیاس، نانو شکاف، مدل تنگ اتصال نانولوله کربنی، ظرفیت کوانتومی،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک و نجوم (عمومی)
چکیده انگلیسی
Landauer-Buttiker formalism with the assumption of semi-infinite electrodes as reservoirs has been the standard approach in modeling steady electron transport through nanoscale devices. However, modeling dynamic electron transport properties, especially nanoscale capacitance, is a challenging problem because of dynamic contributions from electrodes, which is neglectable in modeling macroscopic capacitance and mesoscopic conductance. We implement a self-consistent quantum tight-binding model to calculate capacitance of a nano-gap system consisting of an electrode capacitance Câ² and an effective capacitance Cd of the middle device. From the calculations on a nano-gap made of carbon nanotube with a buckyball therein, we show that when the electrode length increases, the electrode capacitance Câ² moves up while the effective capacitance Cd converges to a value which is much smaller than the electrode capacitance Câ². Our results reveal the importance of electrodes in modeling nanoscale ac circuits, and indicate that the concepts of semi-infinite electrodes and reservoirs well-accepted in the steady electron transport theory may be not applicable in modeling dynamic transport properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters A - Volume 381, Issue 1, 5 January 2017, Pages 44-47
Journal: Physics Letters A - Volume 381, Issue 1, 5 January 2017, Pages 44-47
نویسندگان
Feng Zhai, Jian Wu, Yang Li, Jun-Qiang Lu,