Publication: Dephasing effects induced by weak disorder in superlattices
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1998-08-01
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Elsevier
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Abstract
We investigate the dephasing dynamics of Bloch oscillations in semiconductor superlattices by means of a very simple model including weak disorder and applied electric fields A thorough numerical study of our model allows us to claim that small, unintentional well width fluctuation can be responsible for fast dephasing of Bloch oscillations at low temperatures. We show that the lifetime of Bloch oscillations is controlled by a characteristic time which depends on the degree of disorder and is independent of the electric field This result is further supported by the excellent agreement between our model calculations and several recent experiments, and leads to specifi new predictions.
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Keywords
Superlattices, Bloch oscillations, Disorder, Dephasing mechanisms
Bibliographic citation
Microelectronic Engineering, vol. 43-44, 1 aug 1998. Pp. 117-123