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Sytze de Graaf

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Articles

Atomically Resolved Phase Coexistence in VO2 Thin Films

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By masoud ahmadi, Atul Atul, Sytze de Graaf, Ansgar Meise
| dx.doi.org
Download Hi-Res ImageDownload to MS-PowerPointCite This:ACS Nano 2024, XXXX, XXX Masoud Ahmadi Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands , * Atul Atul Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands *Email: atul061094@gmail.com, a.atul@rug.nl , Sytze de Graaf Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG...
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Creating two-dimensional solid helium via diamond lattice confinement - Nature Communications

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By Weitong Lin, Yiran Li, Sytze de Graaf, Junhao Lin, Shijun Zhao, Jun Fan, Yang Lu, Tao Yang, Bart J. Kooi, Chain Tsuan Liu
| Nature Verified
Abstract The universe abounds with solid helium in polymorphic forms. Therefore, exploring the allotropes of helium remains vital to our understanding of nature. However, it is challenging to produce, observe and utilize solid helium on the earth because high-pressure techniques are required to solidify helium. Here we report the discovery of room-temperature two-dimensional solid helium through the diamond lattice confinement effect.
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Reversible oxygen migration and phase transitions in hafnia-based ferroelectric devices

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By Pavan Nukala, Majid Ahmadi, Yingfen Wei, Sytze de Graaf
| Science Magazine Verified
A role for vacancies Hafnia-based materials are of interest because of their potential use in microelectronic components. Hafnia-oxide is a ferroelectric material, but whether the polarization switching comes from the polar crystal phases or the migration of oxygen vacancies has remained an open question. Nukala et al. attempted to resolve this controversy by conducting electron microscopy during the operation of a hafnium zirconium oxide capacitor.
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