One of the main criteria for realising new, interface-related heterostructure behaviours is the ability to control the atomic and electronic properties on an atomic level which typically requires creating epitaxially matched superlattices. Here, we demonstrate that single-crystalline, misfit-dislocation free interfaces between tetragonal Cu-doped FeSe and trigonal Bi2Te3 symmetry lattices with very large lattice mismatch (19%) can be realised due to the van der Waals-like bonding between the FeSe and Bi2Te3. The atomically resolved interface structure analysis and DFT calculations show that the Se and Te atomic columns are relaxed, so the overall strain is less than 10% and the energy cost associated with such displacements is less than 0.01 eV, which is significantly lower than the thermal energy at room temperature (0.0257 eV).
- Arsham Ghasemi
- Demie Kepaptsoglou
- Vlado K Lazarov
