Universal phase dynamics in VO<sub>2</sub> switches revealed by ultrafast operando diffraction

doi:10.1126/science.abc0652

GSTDTAP > 气候变化

DOI	10.1126/science.abc0652
	Universal phase dynamics in VO₂ switches revealed by ultrafast operando diffraction
	Aditya Sood; Xiaozhe Shen; Yin Shi; Suhas Kumar; Su Ji Park; Marc Zajac; Yifei Sun; Long-Qing Chen; Shriram Ramanathan; Xijie Wang; William C. Chueh; Aaron M. Lindenberg
	2021-07-16
发表期刊	Science
出版年	2021
英文摘要	Vanadium dioxide is known to have a coupled structural and electronic transition that can be accessed through light, thermal, or electrical excitation. Ultrafast optical studies of this insulator-to-metal transition indicate that it is mediated by the formation of a transient metallic phase that retains the structure of the original insulating phase. Sood et al. show that a similar sequence occurs when the material is electrically excited with a series of voltage pulses. Using ultrafast electron diffraction, the researchers monitored the structure of a vanadium dioxide sample after excitation and found evidence of a metastable metallic phase that appears during the transition. Science , abc0652, this issue p. [352][1] Understanding the pathways and time scales underlying electrically driven insulator-metal transitions is crucial for uncovering the fundamental limits of device operation. Using stroboscopic electron diffraction, we perform synchronized time-resolved measurements of atomic motions and electronic transport in operating vanadium dioxide (VO2) switches. We discover an electrically triggered, isostructural state that forms transiently on microsecond time scales, which is shown by phase-field simulations to be stabilized by local heterogeneities and interfacial interactions between the equilibrium phases. This metastable phase is similar to that formed under photoexcitation within picoseconds, suggesting a universal transformation pathway. Our results establish electrical excitation as a route for uncovering nonequilibrium and metastable phases in correlated materials, opening avenues for engineering dynamical behavior in nanoelectronics. [1]: /lookup/doi/10.1126/science.abc0652
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334402
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Aditya Sood,Xiaozhe Shen,Yin Shi,et al. Universal phase dynamics in VO₂ switches revealed by ultrafast operando diffraction[J]. Science,2021.
APA	Aditya Sood.,Xiaozhe Shen.,Yin Shi.,Suhas Kumar.,Su Ji Park.,...&Aaron M. Lindenberg.(2021).Universal phase dynamics in VO₂ switches revealed by ultrafast operando diffraction.Science.
MLA	Aditya Sood,et al."Universal phase dynamics in VO₂ switches revealed by ultrafast operando diffraction".Science (2021).