Journal
PHYSICAL REVIEW B
Volume 78, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.155104
Keywords
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Funding
- Ministry of Education, Culture, Sport, Science and Technology (MEXT), Japan [15104006, 16076205, 17105002, 19048015]
- The Physical Sciences Frontier
- Japan Society of the Promotion of Science [19840053]
- Grants-in-Aid for Scientific Research [19840053] Funding Source: KAKEN
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We study the nonequilibrium switching phenomenon associated with the metal-insulator transition under electric field E in correlated insulators 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 (similar to 10(4) V cm(-1)) much weaker than that for the Zener breakdown. It is also found that the localized midgap 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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