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Quasiparticles at the Mott transition in V2O3

Performing ARPES at low photon energy, we were able to observe for the first time the wavevector dependence of the quasiparticle peak in the metallic phase of V2O3 and to follow its attenuation at the surface. This point out LE-PES can be a sufficiently bulk sensitive probe in strongly correlated materials.

  Rodolakis et al., Phys. Rev. Lett. 102, 066805 (2009).

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 gamma-Z 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)].

Retrieve article
Quasiparticles at the Mott Transition in V2O3: Wave Vector Dependence and Surface Attenuation
F. Rodolakis, B. Mansart, E. Papalazarou, S. Gorovikov, P. Vilmercati, L. Petaccia, A. Goldoni, J. P. Rueff, S. Lupi, P. Metcalf, and M. Marsi,
Phys. Rev. Lett. 102, 066805 (2009).
doi: 10.1103/PhysRevLett.102.066805

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Last Updated on Monday, 30 January 2017 13:07