Fig. 1: Experimental set-up for momentum-resolved Electron Energy Loss Spectroscopy (q-EELS) on 2H-TaS2 metallic monolayers.
From: Slow and highly confined plasmons observed in atomically thin TaS2
a Schematic of the experimental set-up, using a near-parallel, under-focused electron beam (orange) in a Scanning Transmission Electron Microscope (STEM) with very high momentum (q) resolution (0.0056 Å−1) in reciprocal space. 2D plasmons of energy \(\hslash \omega (q)\) are predicted to disperse outside the electron-hole continuum, indicated by the dark region between the interband and intraband Landau damping regions9. b Bright field light microscope image of 2H-TaS2 monolayers after electrochemical exfoliation, and experimental demonstration of superconductivity with measured superconducting transition temperature \({T}_{c}=3\,{K}\), demonstrating the high quality of the used sample material. c Raman spectroscopy of the 2H-TaS2 flakes with varying thicknesses, from monolayer (1 L) to >10 atomic layers (>10 L).
