Abstract
The surface phonon dispersion of cleaved InP(110) surfaces was measured by use of high-resolution electron energy-loss spectroscopy (HREELS) along the symmetry directions gGX and gGX′ , i.e., parallel and perpendicular to the surface In-P chains. Besides an acoustic surface phonon branch with energy lower than 9 meV, four optical phonon bands with little dispersion were recorded at 9.5, 19.5, 30.5 to 33.5, and 42.3 meV. The band with excitation energies around 32 meV represents a true surface mode as it is located in the energy gap between the acoustic and optical bulk phonon bands. The results are compared with available calculations of InP(110) surface phonons.
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