Effect of Exchange-type Zero-bias Anomaly on Single Electron Tunnelling   of Au Nanoparticles
  Using cryogenic scanning tunnelling microscopy and scanning tunnelling spectroscopy we measured single electron tunnelling of isolated Au nanoparticles with 1.4 nm in radius. We observe that a gap {\Delta}V ~ 2e/C (C is the capacitance of the Au particle) around zero bias in the tunnelling conductance spectrum, followed by a series of discrete single electron tunnelling peaks with voltage widths of EC ~ e/C at both negative and positive bias. Experimental data are well explained by taking into account the effect of exchange interaction of electrons on the single electron tunnelling of Au nanoparticles. A tunnelling peak near zero-bias was suppressed by the exchange-type zero-bias anomaly, which results in the gap {\Delta}V ~ 2EC. 
Rui Xu, Yi Sun, Hui Yan, Ji-Yong Yang, Lin He, Jia-Cai Nie, and Yadong   Li
cond-mat.mes-hall cond-mat.str-el