Contribution to the theory of “incompressible” regions in an inhomogeneous magnetized 2D electronic system |
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Authors: | V B Shikin Yu V Shikina |
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Institution: | (1) Institute of Solid-State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow District, Russia;(2) Institute of Microelectronics Technology and Ultrapure Materials, Russian Academy of Sciences, 142432 Chernogolovka, Moscow District, Russia |
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Abstract: | A modification of the theory of “incompressible” regions in an ideal spinless inhomogeneous magnetized 2D electronic system near points on the electron density profile n(x) with an integer filling factor is proposed. Such regions leads to the appearance of a finite capacitance between the parts
of the 2D system that are separated by an incompressible channel, so that capacitive methods can be used to investigate such a system.
The Corbino configuration is especially convenient for these purposes. The parameters of the “incompressible” channel in a
Corbino disk with a spatially inhomogeneous 2D electronic system in the presence of an individual point, near the channel, on the electron density profile with an integer
magnetic filling factor are determined. The magnetocapacitance between the edges of the Corbino disk separated by an incompressible
interlayer is found for cases of practical interest. It is shown that this magnetocapacitance contains direct information
about the width of the integer strip.
Fiz. Tverd. Tela (St. Petersburg) 41, 1103–1109 (June 1999) |
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