ISSN:
1090-6487
Schlagwort(e):
73.61.At
;
73.40.Qv
;
73.50.Dn
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We report on the first observation and studies of a weak delocalizing logarithmic temperature dependence of the conductivity, which causes the conductivity of the 2D metal to increase as T decreases down to 16 mK. The prefactor of the logarithmic dependence is found to decrease gradually with density, to vanish at a critical density n c , 2∼2×1012 cm−2, and then to have the opposite sign at n〉n c ,2. The second critical density sets the upper limit on the existence region of the 2D metal, whereas the conductivity at the critical point, G c ,2∼120e 2/h, sets an upper (low-temperature) limit on its conductivity.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1134/1.567902
Permalink
