Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 51: 2D Materials: Stacking and heterostructures (joint session O/HL/TT)
HL 51.8: Talk
Friday, March 13, 2026, 11:15–11:30, HSZ/0401
Twisted NbSe2 heterostructures — •Alexander Bäder1,2, Clara Pfister3,4, Tobias Wichmann1,5, Laura Pätzold3,4, Tim O. Wehling3,4, and Felix Lüpke1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich — 2II. Physikalisches Institut, Universität zu Köln — 3I. Institute of Theoretical Physics, U Hamburg — 4The Hamburg Centre for Ultrafast Imaging — 5Institut für Experimentalphysik IV A, RWTH Aachen
We fabricated monolayers (MLs) of the van der Waals material NbSe2 that are rotated with respect to the underlying bulk NbSe2 using our developed ultra-high vacuum (UHV) stacking technique. These heterostructures were characterized through the use of scanning tunneling microscopy and spectroscopy at a base temperature of 1.4 K. The MLs realize a variety of twist angles relative to the underlying bulk lattice, with the lowest observed twist angle being 10∘. The MLs display the coexistence of charge density waves (CDW) and moiré effects: In the absence of strain, the MLs develop a 3×3 CDW, however the application of strain through interfacial disorder results in a 2×2 CDW state, supported by theoretical calculations. Compared to isolated MLs the superconducting order parameter is enhanced due to the proximity effect from the underlying bulk.
Keywords: NbSe2; Tiwsted; Monolayer; Charge density wave; Superconductivity