Current-Driven Insulator-To-Metal Transition in Strongly Correlated VO2

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Despite extensive studies on the insulator-to-metal transition (IMT) in strongly correlated VO2, the fundamental mechanism underlying the current-driven IMT in VO2 is still not well understood. Although it is generally believed that the mechanism is Joule heating leading to a rise in temperature to above the normal transition temperature, there is ample experimental evidence demonstrating that the transition could be driven by nonthermal electronic processes. Here we formulate a phase-field model to demonstrate that the electric current may drive the IMT isothermally via the current-induced electron-correlation weakening. We discover that a current with a large density (on the order of 10nA/nm2) induces ultrafast resistive switching on the order of a few nanoseconds, consistent with experimental measurements. We also construct the temperature-current phase diagram and investigate the influence of the current on domain walls. This work is expected to provide guidance for understanding the current-driven IMT in VO2 and for designing VO2-based electric switching devices.

Original languageEnglish (US)
Article number014059
JournalPhysical Review Applied
Volume11
Issue number1
DOIs
StatePublished - Jan 1 2019

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transition metals
insulators
Joule heating
electric current
domain wall
transition temperature
phase diagrams
temperature
electronics
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Current-Driven Insulator-To-Metal Transition in Strongly Correlated VO2",
abstract = "Despite extensive studies on the insulator-to-metal transition (IMT) in strongly correlated VO2, the fundamental mechanism underlying the current-driven IMT in VO2 is still not well understood. Although it is generally believed that the mechanism is Joule heating leading to a rise in temperature to above the normal transition temperature, there is ample experimental evidence demonstrating that the transition could be driven by nonthermal electronic processes. Here we formulate a phase-field model to demonstrate that the electric current may drive the IMT isothermally via the current-induced electron-correlation weakening. We discover that a current with a large density (on the order of 10nA/nm2) induces ultrafast resistive switching on the order of a few nanoseconds, consistent with experimental measurements. We also construct the temperature-current phase diagram and investigate the influence of the current on domain walls. This work is expected to provide guidance for understanding the current-driven IMT in VO2 and for designing VO2-based electric switching devices.",
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Current-Driven Insulator-To-Metal Transition in Strongly Correlated VO2. / Shi, Yin; Chen, Long Qing.

In: Physical Review Applied, Vol. 11, No. 1, 014059, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Chen, Long Qing

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AB - Despite extensive studies on the insulator-to-metal transition (IMT) in strongly correlated VO2, the fundamental mechanism underlying the current-driven IMT in VO2 is still not well understood. Although it is generally believed that the mechanism is Joule heating leading to a rise in temperature to above the normal transition temperature, there is ample experimental evidence demonstrating that the transition could be driven by nonthermal electronic processes. Here we formulate a phase-field model to demonstrate that the electric current may drive the IMT isothermally via the current-induced electron-correlation weakening. We discover that a current with a large density (on the order of 10nA/nm2) induces ultrafast resistive switching on the order of a few nanoseconds, consistent with experimental measurements. We also construct the temperature-current phase diagram and investigate the influence of the current on domain walls. This work is expected to provide guidance for understanding the current-driven IMT in VO2 and for designing VO2-based electric switching devices.

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