Current and shot noise in two capacitively coupled single electron transistors with an atomic sized spacer |
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Authors: | G Micha?ek BR Bu?ka |
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Institution: | (1) Institute of Molecular Physics, Polish Academy of Sciences, ul.Smoluchowskiego 17, 60-179 Poznań, Poland, PL |
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Abstract: | The currents and their fluctuations in two capacitively coupled single electron transistors are determined in the limit of
sequential tunnelling. Our considerations are restricted to the case when the islands (dots) of the transistors are atomic-sized,
which means each of them has only one single electronic level available for the tunnelling processes. The Coulomb interactions
of accumulated charges on the both single electron transistors lead to the effect of the negative differential resistance.
An enhancement of the current shot-noise was also found. Spectral decomposition analysis indicated the two main contributions
to the shot-noise: low- and high-frequency fluctuations. It was found that the low frequency fluctuations (polarization noise)
are responsible for a strong enhancement of the current noise.
Received 9 October 2001 / Received in final form 8 March 2002 Published online 9 July 2002 |
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Keywords: | PACS 73 23 Hk Coulomb blockade single-electron tunnelling – 73 40 Gk Tunnelling – 73 50 Td Noise processes and phenomena |
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