Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 4: 2D Materials and their Heterostructures I (joint session DS/HL)
HL 4.1: Vortrag
Montag, 17. März 2025, 15:00–15:15, H3
Nanoscale NMR of two-dimensional solids using NV centers in diamond — •Marcel Martin1, Mokessh Kannah Ciwan1, Yejin Lee2, Jakob Nachtigal1, Nicola Poccia3, 4, Uri Vool2, Jürgen Haase1, and Nabeel Aslam1 — 1Leipzig University, Leipzig, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 4Department of Physics, University of Naples Federico II, Naples, Italy
Nuclear magnetic resonance (NMR) is a powerful method to investigate electronic properties of condensed matter but is inherently limited by its low sensitivity. Nitrogen-vacancy (NV) centers in diamond are quantum sensors that allow extending NMR to thin films and µm-scale exfoliated flakes of 2D materials which exhibit electronic phases such as charge density waves (CDW) and superconductivity. For the latter, NMR is especially powerful as it can elucidate the pairing symmetry of the charge carriers.
In this talk, we first discuss solid-state nano-NMR with NV centers of CaF2, a testbed material for this method. The ultimate goal, however, is to study the CDW and Ising superconductivity phases of few-layer NbSe2 with nano-NMR. In this context, we present initial optical studies of NbSe2 flakes which have been exfoliated and transferred onto a diamond. In addition to this, we will present results of conventional NMR on bulk NbSe2 which serve as a reference.
Keywords: Niobium Diselenide; Nuclear Magnetic Resonance; NV Center; Superconductivity; Charge Density Wave