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Frequency Dependence of Shot Noise in Resonant Diodes under Coherent Tunneling

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Aleshkin V., Reggiani L., Rosini M.
Acta Physica Polonica A
|
2005
|
vol. 107
|
issue 2
298-303
EN
The current spectral density and the Fano factor of a resonant diode are investigated as a function of frequency up to values just below the inverse of the transit time. We consider the case of coherent tunneling for a symmetric double barrier structure at voltages up to the first current peak at 77 K. At high frequencies the Fano factor is found to become suppressed systematically at a value of 0.25 independently of frequency. This suppression below 0.5 is an indication of coherent against sequential tunneling transport.
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