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SYMMETRY BREAKING AND RESTORING UNDER HIGH PRESSURE: THE “SIMPLE” ALKALI METALS

Light alkali metals such as lithium have been predicted to undergo a metal-insulator transition at high pressure, the insulating phase being characterized by a considerable reduction of lattice symmetry. Here, we argue that such a tendency towards symmetry reduction could be due to electron correlations. More specifically, we suggest that an ionic lattice surrounded by a Fermi liquid changes phase several times under pressure, oscillating between the symmetric phase and a low-symmetry dimerized phase, as a consequence of Friedet oscillations in the pair potential.