Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)

O 66.6: Talk

Wednesday, March 18, 2020, 11:45–12:00, WIL B321

Charge density wave and superconductivity of single-layer NbSe2 on different screening environments — •Wen Wan, Paul Dreher, Marco Gobbi, and Miguel M. Ugeda — Donostia International Physics Center and Centro de Física de Materiales, San Sebastián-Donostia, Spain

Superconductivity and charge density wave order, typical collective electronic phases of transition metal chalcogenides (TMD), are highly sensitive to external perturbations. In the 2D limit, the properties, and even the mere existence, of these phases in monolayers of TMDs become mostly dependent on the supporting substrate due to charge doping/screening and hybridization effects [1,2]. Here, we carry out low-temperature STM/STS (350 mK) measurements to study the electronic structure of single-layer NbSe2 grown on different substrates by molecular beam epitaxy. In particular, we explore and compare the fate and fundamental properties of the superconducting and CDW states of single-layer NbSe2 on both highly metallic, semi-metallic and insulating TMD substrates [3].

[1] M. M. Ugeda, et al. Nature Physics 12, 92 (2016).

[2] Stan, et al. Phys. Rev. Mat. 3, 044003 (2019).

[3] W. Wan, et al., in preparation.