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Open Access Nano Express

The intensive terahertz electroluminescence induced by Bloch oscillations in SiC natural superlattices

Vladimir Sankin*, Alexandr Andrianov, Alexey Petrov, Alexey Zakhar‘in, Ala Lepneva and Pavel Shkrebiy

Author Affiliations

A.F. Ioffe Physico-Technical Institute, 26 Politekhnicheskaya, St. Petersburg, 194021, Russia

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Nanoscale Research Letters 2012, 7:560  doi:10.1186/1556-276X-7-560

Published: 9 October 2012

Abstract

We report on efficient terahertz (THz) emission from high-electric-field-biased SiC structures with a natural superlattice at liquid helium temperatures. The emission spectrum demonstrates a single line, the maximum of which shifts linearly with increases in bias field. We attribute this emission to steady-state Bloch oscillations of electrons in the SiC natural superlattice. The properties of the THz emission agree fairly with the parameters of the Bloch oscillator regime, which have been proven by high-field electron transport studies of SiC structures with natural superlattices.

Keywords:
Terahertz emission; Natural superlattice; Bloch oscillations; Wannier-Stark localization; Transport in high electrical fields; 78.66 Fd; 73.20.Dx