Field-induced metal-insulator transition and switching phenomenon in correlated insulators

Details Field-induced metal-insulator transition and switching phenomenon in correlated insulators Field-induced metal-insulator transition and switching phenomenon in correlated insulators

2007-12-10

arxiv.org/abs/0712.1390v2

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures. A study on the metal-insulator transition in correlated insulators was added

Scientific paper

10.1103/PhysRevB.78.155104

We study the nonequilibrium switching phenomenon associated with the metal-insulator transition under electric field E in correlated insulator by a gauge-covariant Keldysh formalism. Due to the feedback effect of the resistive current I, this occurs as a first-order transition with a hysteresis of I-V characteristics having a lower threshold electric field (\sim 10^4 Vcm^{-1}) much weaker than that for the Zener breakdown. It is also found that the localized mid-gap states introduced by impurities and defects act as hot spots across which the resonant tunneling occurs selectively, which leads to the conductive filamentary paths and reduces the energy cost of the switching function.

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