Cross-Sectional Scanning Tunneling Microscopy and Spectroscopy of   Semimetallic ErAs Nanostructures Embedded in GaAs
  The growth and atomic/electronic structure of molecular beam epitaxy (MBE)-grown ErAs nanoparticles and nanorods embedded within a GaAs matrix are examined for the first time via cross-sectional scanning tunneling microscopy (XSTM) and spectroscopy (XSTS). Cross sections enable the interrogation of the internal structure and are well suited for studying embedded nanostructures. The early stages of embedded ErAs nanostructure growth are examined via these techniques and compared with previous cross sectional TEM work. Tunneling spectroscopy I(V) for both ErAs nanoparticles and nanorods was also performed, demonstrating that both nanostructures are semimetallic. 
Jason K. Kawasaki, Rainer Timm, Trevor E. Buehl, Edvin Lundgren,   Anders Mikkelsen, Arthur C. Gossard and Chris J. Palmstr{\o}m
cond-mat.mtrl-sci cond-mat.mes-hall