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Single fluorescent molecules embedded in the bulk of host crystals haveproven to be excellent probes of the dynamics in their nano environment, thanksto their narrow (about 0.1 {\mu}eV) optical linewidth of the 0-0 zero-phononline (0-0 ZPL) at cryogenic temperatures. However, the optical linewidths ofthe 0-0 ZPL have been found to increase dramatically as the single moleculesare located closer to a surface or interface, while no 0-0 ZPL has beendetected for organic molecules on any surface. Here, we study singlefluorescent terrylene molecules adsorbed on the surface of hexagonalboron-nitride (hBN) substrates. Our low-temperature results show for the firsttime the observation of the 0-0 ZPL of fluorescent molecules on a surface. Withresonant excitation, we find 0-0 ZPL linewidths down to values that are about10 times larger than the Fourier limit of 45 +/- 3 MHz, dictated by thefluorescence lifetime. We compare our results for molecules deposited on thesurfaces of annealed and non-annealed hBN flakes and we see a markedimprovement in the spectral stability of the emitters after annealing. Ourhigh-resolution spectra obtained on terrylene suggest the possibility ofemploying hBN in combination with a wide variety of single molecule emittersfor investigation of physical phenomena at surfaces or for use in nanophotonicdevices.

Sharp zero-phonon lines of single organic molecules on a hexagonal boron-nitride surface