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We study the electronic structure of Mott-Hubbard systems SrVO$_{3}$ andCaVO$_3$ with bulk and surface-sensitive high-resolution photoemissionspectroscopy (PES), using a VUV laser, synchrotron radiation and a dischargelamp ($h\nu$ = 7 - 21 eV). A systematic suppression of the density of states(DOS) within $\sim$ 0.2 eV of the Fermi level ($E_F$) is found on decreasingphoton energy i.e. on increasing bulk sensitivity. The coherent band inSrVO$_{3}$ and CaVO$_3$ is shown to consist of surface and bulk derivedfeatures, separated in energy. The stronger distortion on surface of CaVO$_{3}$compared to SrVO$_{3}$ leads to higher surface metallicity in the coherent DOSat $E_F$, consistent with recent theory.Comment: 4 pages 5 figures (including 2 auxiliary figures); A complete  analysis of the spectra based on the surface and bulk analysis shows in  auxiliary figures Fig. A1 and A

physical review letters

Bulk- and Surface-Sensitive High-Resolution Photoemission Study of Two Mott-Hubbard Systems:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrVO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CaVO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Bulk- and Surface-Sensitive High-Resolution Photoemission Study of Two Mott-Hubbard Systems:SrVO3andCaVO3