Results 51 to 60 of about 8,251 (220)

How fast can vanadium dioxide neuron-mimicking devices oscillate? Physical mechanisms limiting the frequency of vanadium dioxide oscillators

Neuromorphic Computing and Engineering, 2023
The frequency of vanadium dioxide (VO _2 ) oscillators is a fundamental figure of merit for the realization of neuromorphic circuits called oscillatory neural networks (ONNs) since the high frequency of oscillators ensures low-power consuming, real-time ...
S Carapezzi, A Plews, G Boschetto, A Nejim, S Karg, A Todri-Sanial   +5 more
doaj   +1 more source

Dual-broadband terahertz absorber based on phase transition characteristics of VO2

Results in Physics, 2022
A dual-broadband absorption metamaterial based on a composite structure consisting of metal and vanadium dioxide is designed and analyzed. By controlling the temperature of vanadium dioxide, the absorption band of the device can be manipulated.
Hao Luo, Hai Liu, Cong Chen, Yue Feng, Peng Gao, Zi Yan Ren, Yu Jia Qiao   +6 more
doaj   +1 more source

Competing phases in epitaxial vanadium dioxide at nanoscale [PDF]

APL Materials, 2019
Phase competition in correlated oxides offers tantalizing opportunities as many intriguing physical phenomena occur near the phase transitions. Owing to a sharp metal-insulator transition (MIT) near room temperature, the correlated vanadium dioxide (VO2) exhibits a strong competition between insulating and metallic phases, which is important for ...
Yogesh Sharma, Martin V. Holt, Nouamane Laanait, Xiang Gao, Ilia N. Ivanov, Liam Collins, Changhee Sohn, Zhaoliang Liao, Elizabeth Skoropata, Sergei V. Kalinin, Nina Balke, Gyula Eres, Thomas Z. Ward, Ho Nyung Lee   +13 more
openaire   +3 more sources

Orientation‐Engineered Insulator‐Metal Transition in Vanadium Dioxide

Advanced Science, EarlyView.
Crystallographic orientation engineering in VO2/TiO2 heterostructures enables tunable insulator‐metal transitions. The high‐Miller‐index (102) orientation breaks in‐plane mirror symmetry, inducing anisotropic transport, while its inclined oxygen channels accelerate protonation kinetics.
Xuanchi Zhou, Xiaohui Yao, Wentian Lu, Chunwei Yao, Xiaomei Qiao   +4 more
wiley   +1 more source

Reduction of V4+ from V5+ using polymer as a surfactant for electrochemical applications

International Journal of Electrochemical Science, 2010
Vanadium dioxide nanowires and nanobelts were synthesized from vanadium pentoxide xerogel through a hydrothermal process. V5+ was reduced to V4+ by a polyblend of poly(vinyl pyrrolidone) (PVP) and poly(vinyl alcohol)(PVA), and by poly(vinyl alcohol)(PVA).
V S Reddy Channu, Rudolf Holze, B. Rambabu, Rajamohan R. Kalluru, Quinton L. Williams, Chen Wen   +5 more
doaj   +1 more source

Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide

Nano Letters, 2021
Abstract: An induced-transmission filter (ITF) uses an ultrathin layer of metal positioned at an electric-field node within a dielectric thin-film bandpass filter to select one transmission band while suppressing other transmission bands that would have been present without the metal layer.
Chenghao Wan, David Woolf, Colin M. Hessel, Jad Salman, Yuzhe Xiao, Chunhui Yao, Albert Wright, Joel M. Hensley, Mikhail A. Kats   +8 more
openaire   +3 more sources

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Theoretical study on the pressure-induced phase transition in vanadium dioxide

Хімія, фізика та технологія поверхні, 2015
The effect of external pressure on the parameters of phase transiton in vanadium dioxide has been studied theoretically by means of quantum chemistry with use of cyclic (VO2)8 models with minimized strains in the closed chain.
A. G. Grebenyuk, V. N. Kaurkovskaya, V. V. Lobanov   +2 more
doaj   +1 more source

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

Temperature switchable terahertz metasurface for multifunctional wavefront manipulation

Open Physics
In this paper, a metasurface by utilizing the phase transition properties of vanadium dioxide is designed, which is capable of realizing the dynamic switching of two different functions by changing the temperature.
Ma Qingxiu, Deng Yun, Wu Wei, Liang Jiajun   +3 more
doaj   +1 more source