Foundry staff and users created a new spin-1/2 system by generating magnetic carbon radical ions (CRIs) in two-dimensional tungsten disulfide with atomic precision and characterized the vibronic coupling of their spin-polarized defect states.
Significance and Impact
This work introduces a new type of magnetic defect that can be created with atomic precision while keeping the surrounding atomic structure virtually unchanged. The system provides a new building block for developing quantum technologies.
- The research team created carbon impurity defects at chalcogen sites using scanning tunneling microscopy (STM)-induced hydrogen desorption from carbon-hydrogen complexes in WS2 and WSe2, generating a carbon radical ion in WS2 with a net magnetic moment of 1 µB.
- The researchers used inelastic transport spectroscopy and density functional theory (DFT) calculations to quantify the vibronic coupling of a single CRI to the host lattice.
- They determined that the electron–phonon coupling is dominated by a few modes only, whose coupling strengths is stronger for monolayer WS2 as compared to bilayer WS2.
- The variations in the coupling strengths between different defect orbitals further revealed that the vibronic coupling in CRIs is spin-dependent.