Nonohmic hopping conductivity in the exponential band tail
Gurvich Yu. A., Melnikov A. P., Shestakov L. N., Gershenzon E. M.
The variable range hopping conductivity in a strong electric field £ at a temperature T=0 is investigated. An exponential increase of the density of states g(e) with energy ε is assumed. It is shown that there is an energy level ε=εΒ(Ε) ("the transport level"), along which an electron hops without rising or lowering in average. The dependence σ{ε) has the form: —In σ~\/Ε. © 1994 American Institute of Physics.
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![](/ps/1359/article_20539_800_head.png "The variable range hopping conductivity in a strong electric field £ at a temperature <i>T=0 </i>is investigated. An exponential increase of the density of states <i>g(e) </i>with energy ε is assumed. It is shown that there is an energy level <i>ε=ε<sub>Β</sub>(Ε) </i>("the transport level"), along which an electron hops without rising or lowering in average. The dependence <i>σ{ε) </i>has the form: —In <i>σ~\/Ε. © 1994 American Institute of Physics.</i>")