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The first-order metal-insulator transition (MIT) in paramagnetic $V_{2}O_{3}$is studied within the ab-initio scheme LDA+DMFT, which merges the local densityapproximation (LDA) with dynamical mean field theory (DMFT). With a fixed valueof the Coulomb $U=6.0 eV$, we show how the abrupt pressure driven MIT isunderstood in a new picture: pressure-induced decrease of the trigonaldistortion within the strong correlation scenario (which is not obtained withinLDA). We find good quantitative agreement with $(i)$ switch of the orbitaloccupation of $(a_{1g},e_{g1}^{\pi}, e_{g2}^{\pi})$ and the spin state S=1across the MIT, $(ii)$ thermodynamics and $dc$ resistivity, and $(iii)$ theone-electron spectral function, within this new scenario.Comment: 4 pages, 4 figures, submitted to PR

physical review letters

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Orbital Switching and the First-Order Insulator-Metal Transition in ParamagneticV2O3