Electron tunneling into thin films of antimony

Electron tunneling measurements have been performed to investigate the anisotropic effect in both the band structure and the phonons of semimetal antimony films. Depending upon the texturization of antimony films, the definite change in shape of the tunnel conductance is observed and the intravalley acoustic phonon peak becomes apparent as well as the intervalley acoustic and optical phonon peaks in the second derivatives. Furthermore, the overtone phonon peak exhibits an asymmetric structure contrary to that of the Raman spectrum. This asymmetry is not observed in point contact spectra.