NDLI: A.c. transport and collective excitations in a quantum point contact

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A.c. transport and collective excitations in a quantum point contact

Content Provider	Scilit
Author	Aronov, I. E. Beletskii, Nikolay Berman, G. P. Campbell, D. K. Doolen, G. D. Dudiy, S. V. Mainieri, R.
Copyright Year	1998
Description	Journal: Semiconductor Science and Technology We study the a.c. transport through a two-dimensional quantum point contact (QPC) using a Boltzmann-like kinetic equation derived for the partial Wigner distribution function. An integral equation for a potential inside a QPC is solved numerically. It is shown that the electric field inside a QPC is an inhomogeneous function of the spatial coordinate, with a characteristic scale equal to the distance between the electron's turning points. A dependence of the admittance on the frequency of the a.c. field is found in the frequency range, -50 GHz. The contribution to the imaginary part of the admittance due to the open and closed channels is numerically calculated. It is shown that the crossover of quantum capacitance and quantum inductance from localized behaviour to distributed behaviour takes place at GHz. A transition from 2D plasmons to quasi-1D plasmons is analysed as a function of two dimensionless parameters: (where is the longitudinal wavevector and is the width of the QPC) and the number of open electron channels, N.
Related Links	http://iopscience.iop.org/article/10.1088/0268-1242/13/8A/031/pdf
Ending Page	A106
Page Count	3
Starting Page	A104
ISSN	02681242
e-ISSN	13616641
DOI	10.1088/0268-1242/13/8a/031
Journal	Semiconductor Science and Technology
Issue Number	8A
Volume Number	13
Language	English
Publisher	IOP Publishing
Publisher Date	1998-08-01
Access Restriction	Open
Subject Keyword	Journal: Semiconductor Science and Technology Integral Equation Quantum Point Contact
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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