Admittance of a one-dimensional double-barrier resonant tunneling nanostructure

We study the dynamic response of a one-dimensional double-barrier nanostructure to an ac bias. Combining the Schrödinger equation, Poisson equation and the scattering theory, we calculate the internal potential, charge density, and the ac conductance as well. The results show that the charge distrib...

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Main Authors: Shangguan, Wang Zuo, Au Yeung, Tin Cheung, Yu, Ya Bin, Kam, Chan Hin, Zhao, Xuean
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/88776
http://hdl.handle.net/10220/44724
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-887762020-03-07T14:02:36Z Admittance of a one-dimensional double-barrier resonant tunneling nanostructure Shangguan, Wang Zuo Au Yeung, Tin Cheung Yu, Ya Bin Kam, Chan Hin Zhao, Xuean School of Electrical and Electronic Engineering Conductance Dynamics We study the dynamic response of a one-dimensional double-barrier nanostructure to an ac bias. Combining the Schrödinger equation, Poisson equation and the scattering theory, we calculate the internal potential, charge density, and the ac conductance as well. The results show that the charge distribution is antisymmetric with respect to the center of the double barrier, and depends crucially on the relative position of the Fermi level to the resonant energies of the well. The diagonal emittance is found to have a similar dependence. It is negative (inductive behavior) when the Fermi energy is very close to the resonant energies, and it reaches the negative maximum at resonant energies, while it is always positive (capacitive behavior) when the Fermi energy is within the barrier depth and far from resonance, and develops two peaks closely on both sides of the inductive peak. This result is in agreement with that obtained from discrete model. In addition, we find that the capacitive peaks correspond to the maxima of charge-density fluctuation, and inductive peaks to zero charge-density distribution. Therefore, the sign and magnitude of emittance reflect how the charge piles up inside the device. Published version 2018-04-26T05:10:07Z 2019-12-06T17:10:42Z 2018-04-26T05:10:07Z 2019-12-06T17:10:42Z 2002 Journal Article Shangguan, W. Z., Au Yeung, T. C., Yu, Y. B., Kam, C. H., & Zhao, X. (2002). Admittance of a one-dimensional double-barrier resonant tunneling nanostructure. Physical Review B - Condensed Matter and Materials Physics, 65(23), 235315-. 2469-9950 https://hdl.handle.net/10356/88776 http://hdl.handle.net/10220/44724 10.1103/PhysRevB.65.235315 en Physical Review B - Condensed Matter and Materials Physics © 2002 American Physical Society (APS). This paper was published in Physical Review B - Condensed Matter and Materials Physics and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [doi:http://dx.doi.org/10.1103/PhysRevB.65.235315]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 8 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Conductance
Dynamics
spellingShingle Conductance
Dynamics
Shangguan, Wang Zuo
Au Yeung, Tin Cheung
Yu, Ya Bin
Kam, Chan Hin
Zhao, Xuean
Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
description We study the dynamic response of a one-dimensional double-barrier nanostructure to an ac bias. Combining the Schrödinger equation, Poisson equation and the scattering theory, we calculate the internal potential, charge density, and the ac conductance as well. The results show that the charge distribution is antisymmetric with respect to the center of the double barrier, and depends crucially on the relative position of the Fermi level to the resonant energies of the well. The diagonal emittance is found to have a similar dependence. It is negative (inductive behavior) when the Fermi energy is very close to the resonant energies, and it reaches the negative maximum at resonant energies, while it is always positive (capacitive behavior) when the Fermi energy is within the barrier depth and far from resonance, and develops two peaks closely on both sides of the inductive peak. This result is in agreement with that obtained from discrete model. In addition, we find that the capacitive peaks correspond to the maxima of charge-density fluctuation, and inductive peaks to zero charge-density distribution. Therefore, the sign and magnitude of emittance reflect how the charge piles up inside the device.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Shangguan, Wang Zuo
Au Yeung, Tin Cheung
Yu, Ya Bin
Kam, Chan Hin
Zhao, Xuean
format Article
author Shangguan, Wang Zuo
Au Yeung, Tin Cheung
Yu, Ya Bin
Kam, Chan Hin
Zhao, Xuean
author_sort Shangguan, Wang Zuo
title Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
title_short Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
title_full Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
title_fullStr Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
title_full_unstemmed Admittance of a one-dimensional double-barrier resonant tunneling nanostructure
title_sort admittance of a one-dimensional double-barrier resonant tunneling nanostructure
publishDate 2018
url https://hdl.handle.net/10356/88776
http://hdl.handle.net/10220/44724
_version_ 1681034087535476736