A method for determining the specific capacitance value of mesoscopic Josephson junctions
Sheng-Shiuan Yeh, Kuan‐Wen Chen, Tao-Hsiang Chung, Dai-Yang Wu, Ming-Chou Lin, Jyh-Yang Wang, I‐Lin Ho, Cen-Shawn Wu, Watson Kuo, Chii‐Dong Chen · Applied Physics Letters · 2012
An approach for precise determination of capacitance values and energy level spacing of mesoscopic Josephson junctions is proposed. Quantized levels arising from plasma oscillation manifest themselves in the current peaks in the current-voltage characteristics of a nearby probe Josephson junction. From peak spacing, the specific capacitance of aluminum junctions is determined to be 35 fF/μm2. In addition, magnetic field dependence of quantum states can be described quantitatively by a theory that takes the effect of field induced surface current into account.