Towards first-principles understanding of the metal-insulator transition in fluid alkali metals

Details Towards first-principles understanding of the metal-insulator transition in fluid alkali metals Towards first-principles understanding of the metal-insulator transition in fluid alkali metals

2008-07-09

arxiv.org/abs/0807.1454v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 5 figures

Scientific paper

10.1088/0953-8984/21/6/064205

By treating the electron-ion interaction as perturbation in the first-principles Hamiltonian, we have calculated the density response functions of a fluid alkali metal to find an interesting charge instability due to anomalous electronic density fluctuations occurring at some finite wave vector ${\bi Q}$ in a dilute fluid phase above the liquid-gas critical point. Since $|{\bi Q}|$ is smaller than the diameter of the Fermi surface, this instability necessarily impedes the electric conduction, implying its close relevance to the metal-insulator transition in fluid alkali metals.

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