Macroscopic Superconducting Current through a Silicon Surface   Reconstruction with Indium Adatoms: Si(111)-(R7$\times$R3)-In
  Macroscopic and robust supercurrents are observed by direct electron transport measurements on a silicon surface reconstruction with In adatoms (Si(111)-(R7xR3)-In). The superconducting transition manifests itself as an emergence of the zero resistance state below 2.8 K. $I-V$ characteristics exhibit sharp and hysteretic switching between superconducting and normal states with well-defined critical and retrapping currents. The two-dimensional (2D) critical current density $J_\mathrm{2D,c}$ is estimated to be as high as $1.8 \ \mathrm{A/m}$ at 1.8 K. The temperature dependence of $J_\mathrm{2D,c}$ indicates that the surface atomic steps play the role of strongly coupled Josephson junctions. 
Takashi Uchihashi, Puneet Mishra, Masakazu Aono, and Tomonobu Nakayama
cond-mat.mes-hall cond-mat.mtrl-sci