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We present a low photon energy angle resolved photoemission study of V₂O₃, a prototype system for the observation of Mott transitions in correlated materials. We show that the spectral features corresponding to the quasiparticle peak in the metallic phase present a marked wave vector dependence, with a stronger intensity along the GZ direction. The analysis of their intensity for different probing depths shows the existence of a characteristic length scale for the attenuation of coherent electronic excitations at the surface. This length scale, which is larger than the thickness of the surface region as normally defined for noncorrelated electronic states, is found to increase when approaching the Mott transition. These results are in agreement with the behavior of quasiparticles at

surfaces as predicted by Borghi et al. [Phys. Rev. Lett. 102, 066806 (2009)].

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F. Rodolakis, B. Mansart, E. Papalazarou, S. Gorovikov, P. Vilmercati, L. Petaccia, A. Goldoni, J. P. Rueff, S. Lupi, P. Metcalf, M. Marsi,
Phys. Rev. Lett. 102, 066805 (2009).
doi: 10.1103/PhysRevLett.102.066805

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