Shot Noise Suppression in SiGe Resonant Interband Tunneling Diodes

Abstract

We report experimental noise studies of SiGe resonant interband tunneling diodes (RITDs) to probe the tunneling transport properties. The shot noise measurements show the signatures of coherent transport not only in the positive differential resistance (PDR) region but also in the plateau-like region on the negative differential resistance (NDR) side of the current-voltage (1-V) trace. The experimentally extracted Fano factor F < 0.5 may suggest that the coherent transport gradually becomes obvious in the NDR region. The variation of the Fano factor through the resonance process is discussed according to the recent theoretical model of coherent tunneling. [DOI: 10.1143/JJAP.47.8752]