Spin-dependent vibronic response of a carbon radical ion in two-dimensional WS2
Abstract
Atomic spin centers in 2D materials are a highly anticipated building block for quantum technologies. Here, we demonstrate the creation of an effective spin-1/2 system via the atomically controlled generation of magnetic carbon radical ions (CRIs) in synthetic two-dimensional transition metal dichalcogenides. Hydrogenated carbon impurities located at chalcogen sites introduced by chemical doping are activated with atomic precision by hydrogen depassivation using a scanning probe tip. In its anionic state, the carbon impurity is computed to have a magnetic moment of 1 μB resulting from an unpaired electron populating a spin-polarized in-gap orbital. We show that the CRI defect states couple to a small number of local vibrational modes. The vibronic coupling strength critically depends on the spin state and differs for monolayer and bilayer WS2. The carbon radical ion is a surface-bound atomic defect that can be selectively introduced, features a well-understood vibronic spectrum, and is charge state controlled.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 15, 2021
- Source ID
- 10.1038/s41467-021-27585-x
Entities
People
- Alexander Weber-bargioni
- Azimkhan Kozhakhmetov
- Bruno Schuler
- Christoph Kastl
- Jascha Repp
- Jeffrey B. Neaton
- Jonah B. Haber
- Joshua A. Robinson
- Junho Lee
- Katherine A Cochrane
- Mauricio Terrones
- Tianyi Zhang