SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 105: Poster Session VIII: Graphene and beyond II
O 105.10: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Proximity effects in the charge density wave order and superconductivity in single-layer NbSe2 — •Wen Wan1, Paul Dreher1, Alla Chikina2, Haojie Guo3, Rishav Harsh1, Marco Bianchi2, Marco Gobbi4, Jose-Maria Gomez-Rodriguez3, Antonio Javier Martinez-Galera3, Philip Hofmann2, Jill A. Miwa2, and Miguel Ugeda1 — 1Donostia International Physics Center, San Sebastián-Donostia, Spain — 2Department of Physics and Astronomy, Aarhus University — 3Dpto. Física de la Materia Condensada, Universidad Autónoma de Madrid — 4CIC Nanogune
Collective electronic states such as the charge density wave (CDW) order and superconductivity respond dramatically to external perturbations. In two-dimensional materials hosting such states, the closeness to unavoidable supporting substrates may lead to significant changes in their properties. Here we explore the impact of proximity effects on the CDW and superconducting states in single-layer NbSe2. We performed the electronic characterization of single-layer NbSe2 on several substrates of opposite metallicity by means of STM/STS at 350 mK, ARPES and 4-point probe transport measurements. In particular, we have epitaxially grown single-layer NbSe2 by MBE on two different metals, Au(111) and BLG/SiC(0001), and two insulators, bulk WSe2 and monolayer h-BN/Ir(111). While both phases disappear on Au(111), they persist on BLG/SiC. The fate of the CDW and superconducting phases is more intricate on insulating substrates, which are largely affected, however, despite of the electronic decoupling of the 2D superconductor with the substrate states.