Scanning tunneling microscopy of interface properties of Bi2Se3 on FeSe

We investigate the heteroepitaxial growth of Bi2Se3 films on FeSe substrates by

low-temperature scanning tunneling microscopy/spectroscopy. The growth of Bi2Se3 on FeSe

proceeds via van der Waals epitaxy with atomically flat morphology. A striped moire pattern ´

originating from the lattice mismatch between Bi2Se3 and FeSe is observed. Tunneling spectra

reveal the spatially inhomogeneous electronic structure of the Bi2Se3 thin films, which can be

ascribed to the charge transfer at the interface.