Moiré superlattice modulations in single-unit-cell FeTe films grown on NbSe2 single crystals*
- 1 December 2021
- journal article
- research article
- Published by IOP Publishing in Chinese Physics B
- Vol. 30 (12), 126801
- https://doi.org/10.1088/1674-1056/ac0816
Abstract
Interface can be a fertile ground for exotic quantum states, including topological superconductivity, Majorana mode, fractal quantum Hall effect, unconventional superconductivity, Mott insulator, etc. Here we grow single-unit-cell (1UC) FeTe film on NbSe2 single crystal by molecular beam epitaxy (MBE) and investigate the film in-situ with a home-made cryogenic scanning tunneling microscopy (STM) and non-contact atomic force microscopy (AFM) combined system. We find different stripe-like superlattice modulations on grown FeTe film with different misorientation angles with respect to NbSe2 substrate. We show that these stripe-like superlattice modulations can be understood as moire pattern forming between FeTe film and NbSe2 substrate. Our results indicate that the interface between FeTe and NbSe2 is atomically sharp. By STM-AFM combined measurement, we suggest that the moire superlattice modulations have an electronic origin when the misorientation angle is relatively small (<= 3 degrees) and have structural relaxation when the misorientation angle is relatively large (>= 10 degrees).Keywords
This publication has 29 references indexed in Scilit:
- Artificial Topological Superconductor by the Proximity EffectPhysical Review Letters, 2014
- Hofstadter’s butterfly and the fractal quantum Hall effect in moiré superlatticesNature, 2013
- Scanning tunneling microscopy of interface properties of Bi2Se3on FeSeJournal of Physics: Condensed Matter, 2012
- Modulation of Step Heights of Thin Pb Films by the Quantum Size Effect Observed by Non-Contact Atomic Force MicroscopyChinese Physics Letters, 2012
- The Coexistence of Superconductivity and Topological Order in the Bi 2 Se 3 Thin FilmsScience, 2012
- Topographic and electronic contrast of the graphene moiré on Ir(111) probed by scanning tunneling microscopy and noncontact atomic force microscopyPhysical Review B, 2011
- Unconventional Superconductivity on a Topological InsulatorPhysical Review Letters, 2010
- Non-Abelian anyons and topological quantum computationReviews of Modern Physics, 2008
- Superconducting Proximity Effect and Majorana Fermions at the Surface of a Topological InsulatorPhysical Review Letters, 2008
- Revealing the hidden atom in graphite by low-temperature atomic force microscopyProceedings of the National Academy of Sciences of the United States of America, 2003