2D Materials – Physics of van der Waals [hetero]structures
DFG Priority program 2244
Topological superconductivity and Majorana states in van der Waals heterostructures characterized by scanning probe microscopy
Felix Lüpke, Forschungszentrum Jülich (PGI-3), f.luepke (at) fz-juelich.de [webpage]
We will explore van der Waals (vdW) heterostructures of atomically thin topological insulators (TI) WTe2 and (Bi1-xSbx)2Te3 on vdW superconductors (SC) NbSe2 and FeTe1-ySey in order to realize topological superconducting states via the superconducting proximity effect. By combination of topological superconducting states with magnetism, in form of a magnetic layer, magnetic clusters and in magnetic flux vortices, we will create Majorana states in the heterostructures. Samples will be studied by scanning tunneling microscopy (STM) at low temperatures to gain a deeper understanding of the underlying physics of topological superconductivity and Majorana states.
vdW heterostructures will be fabricated using a newly developed ‘dry-transfer flip technique’ [Lüpke et al., Nat. Phys. 16, 526 (2020)], as well as epitaxially grown by our collaborators. Samples will be transferred to the measurement chamber without air exposure, a critical aspect to maintain atomically clean surfaces.