2D Ta-based transition metal dichalcogenides have been predicted to host highly confined plasmons, but their observation has been lacking. Here, the authors report momentum-resolved electron energy loss spectroscopy measurements of 2H-TaS2 monolayers and bilayers, showing plasmon resonances with lateral confinement up to 300 and group velocity down to ~10−4c at large wave vectors.
- Hue T. B. Do
- Meng Zhao
- Michel Bosman