Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
753746 | Solid-State Electronics | 2017 | 5 Pages |
Abstract
By measuring the ac impedance, we measure for the first time the crossover from diffusive (ÏÏ<1) to ballistic (ÏÏ>1) transport as a function of frequency (dc to 5 GHz) in a dc contacted 2d electron gas in the low electric field limit, where Ï is the momentum scattering time. The geometry is an “ungated HEMT”, meaning current flows through an ohmic contact into a 2d electron gas, laterally through the 2d electron gas, and out into a second ohmic contact; the 2d electron gas itself is not gated. At the measurement temperature (4.2 K), the low field mobility is 3.2Â ÃÂ 106 cm2/VÂ s. We also measure for the first time the frequency dependent contact impedance in this ballistic limit.
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Electrical and Electronic Engineering
Authors
Sungmu Kang, Peter J. Burke, L.N. Pfeiffer, K.W. West,