A5060034707- Surface and Thin Film Phenomena
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- Topological Materials and Phenomena
- Graphene research and applications
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
Universidad Autónoma de Madrid
2021-2022
We describe a scanning tunneling microscope (STM) that operates at magnetic fields up to 22 T and temperatures down 80 mK. discuss the design of STM head, with an improved coarse approach, vibration isolation system, efforts improve energy resolution using compact filters for multiple lines. measure superconducting gap Josephson effect in aluminum show we can resolve features density states as small 8 μeV. quantization conductance atomic size contacts make images layered material 2H–NbSe2....
The electronic bandstructure of Au$_2$Pb has a Dirac cone which gaps when undergoing structural transition into low temperature superconducting phase. This suggests that the phase ($T_c=1.1$ K) might hold topological properties at surface. Here we make Scanning Tunneling Microscopy experiments on surface Au$_2$Pb. We measure gap and find sizeable density states Fermi level. discuss possible origins for this finding in terms superconductivity induced states.
A Scanning Tunneling Microscope (STM) is one of the most important scanning probe tools available to study and manipulate matter at nanoscale. In a STM, tip scanned on top surface with separation few Å. Often, tunneling current between sample maintained constant by modifying distance apex through feedback mechanism acting piezoelectric transducer. This produces very detailed images electronic properties surface. The nearly always made using digital processing circuit separate from user...