Metal-Insulator Transitions in β′-Cu V2O5 Mediated by Polaron Oscillation and Cation Shuttling
Metal-Insulator Transitions in β′-Cu V2O5 Mediated by Polaron Oscillation and Cation Shuttling
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极化子振荡和阳离子穿梭介导的β-Cu V2O5 中的金属-绝缘体转变
DOI:
10.1016/j.matt.2020.01.027
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发表时间:
2020
期刊:
影响因子:
18.9
通讯作者:
Yang, Wanli
中科院分区:
文献类型:
--
作者:
Parija, Abhishek;Handy, Joseph V.;Andrews, Justin L.;Wu, Jinpeng;Wangoh, Linda;Singh, Sujay;Jozwiak, Chris;Bostwick, Aaron;Rotenberg, Eli;Yang, Wanli
Silicon circuitry has dominated the semiconductor industry for decades but is constrained in its power efficiency by the Fermi-Dirac distribution of electron energies. Electron-correlated transition metal oxides exhibiting metal-to-insulator transitions (MITs) are excellent candidates for energy-efficient computation, which can further emulate the spiking behavior of biological neural circuitry. We demonstrate that β′-CuxV2O5exhibits a pronounced nonlinear response to applied temperature, voltage, and current, and the response can be modulated as a function of Cu stoichiometry. We show that polaron oscillation, coupled to the real-space shuttling of Cu ions across two adjacent sites, underpins the MIT of this material. These results reveal the interplay between crystal structure distortions and electron correlation in underpinning the metal-insulator transition of a strongly correlated system. The utilization of coupled cation diffusion and polaron oscillation further demonstrates a means of using ionic vectors to obtain highly nonlinear conductance switching as required for neuromorphic computing.
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