Logarithmic temperature dependence of the conductivity of the two-dimensional metal
Pudalov V.M., Brunthaler G., Prinz A., Bauer G.
PACS: 71.30.+h, 72.15.Rn
We report on the first observation and studies of a weak delocalizing logarithmic temperature dependence of the conductivity, which increases the conductivity of the 2D metal as Τ decreases down to 16 mK. The prefactor of the logarithmic dependence is found to decrease gradually with density, to vanish at a critical density, nCja ~ 2 ž 1012 cm"2, and to have opposite sign further at η > η<ž,2ž The second critical density sets the upper limit on the range of existence of the 2D metal, whereas the conductivity at the critical point, Gc,2 ~ 120e2/h, sets an upper (low temperature) limit on its conductivity.
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![](/ps/966/article_14750_800_head.png "<b>We report on the first observation and studies of a weak delocalizing logarithmic temperature dependence of the conductivity, which <i>increases </i>the conductivity of the 2D metal as <i>Τ decreases </i>down to 16 mK. The prefactor of the logarithmic dependence is found to decrease gradually with density, to vanish at a critical density, n<sub>Cj</sub>a ~ 2 ž 10<sup>12</sup> cm"<sup>2</sup>, and to have opposite sign further at η > η</b><b><ž,2ž </b><b>The second critical density sets the upper limit on the range of existence of the 2D metal, whereas the conductivity at the critical point, G</b><b><sub>c</sub>,2 </b><b>~ 120e<sup>2</sup>/h, sets an upper (low temperature) limit on its conductivity.</b>")