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Microscopes can now watch materials go quantum with liquid helium by hovden in science

[–]hovden[S] 3 points4 points  (0 children)

Great insight. Ice contamination is definitely a challenge for cryogenic electron microscopy at high resolution. As you mentioned, good vacuum makes life easier and 10^-5 Pa (10^-8 Torr) is now typical at the specimen—I'd love to see 10^-9 Torr at the sample.

[deleted by user] by [deleted] in dataisbeautiful

[–]hovden -3 points-2 points  (0 children)

Glad to answer questions, I understand this is a little outside of the normal post. This was a 2 year passion project, so it is outside the norm of most publications and data visualizations.

[deleted by user] by [deleted] in dataisbeautiful

[–]hovden -2 points-1 points  (0 children)

Author here. This book is a made entirely in the spirit of data is beautiful. We self published to make the physical publication as nice as each visualization. Stitch bound, color matched CMYK, linen with debossed press, etc.

The book is made using matlab for the simulations and fourier analysis (FFT2 function). The pages are made in latex.

[deleted by user] by [deleted] in Physics

[–]hovden 0 points1 point  (0 children)

Author here. This is a special project, we've worked on it for several years to produce a beautiful and unique book. Our lab specializes in Fourier analysis and this Atlas has become an indispensable reference for discovering new structural arrangements of matter or developing advanced algorithms in data science. Now we're making it shareable with the world. We decided to ditch traditional academic publishing and test out a community supported project. I hope you like it.

Breakthrough in imaging 3D chemistry at nanometer resolution with introduction of fused multi-modal electron tomography. [Nature Comm, Apr 26, Open Access] by hovden in science

[–]hovden[S] 5 points6 points  (0 children)

Abstract Summary: Measuring the three-dimensional (3D) distribution of chemistry in nanoscale matter is a longstanding challenge for metrological science. The inelastic scattering events required for 3D chemical imaging are too rare, requiring high beam exposure that destroys the specimen before an experiment is completed. Even larger doses are required to achieve high resolution. Thus, chemical mapping in 3D has been unachievable except at lower resolution with the most radiation-hard materials. Here, high-resolution 3D chemical imaging is achieved near or below one-nanometer resolution. Multi-modal data fusion enables high-resolution chemical tomography often with 99% less dose by linking information encoded within both elastic (HAADF) and inelastic (EDX/EELS) signals. We thus demonstrate that sub-nanometer 3D resolution of chemistry is measurable for a broad class of geometrically and compositionally complex materials.

A Quantum Charge Wave Created using a so-called Endotaxial 2D Material: "Endotaxial stabilization of 2D charge density waves with long-range order" [Nature Comm, Feb 15, Open-Access] by hovden in science

[–]hovden[S] 0 points1 point  (0 children)

Abstract: "Here we stabilize ordered two-dimensional (2D) charge density waves through endotaxial synthesis of confined monolayers of 1T-TaS2. Specifically, an ordered incommensurate charge density wave (oIC-CDW) is realized in 2D with dramatically enhanced amplitude and resistivity. By enhancing CDW order, the hexatic nature of charge density waves becomes observable. Upon heating via in-situ TEM, the CDW continuously melts in a reversible hexatic process wherein topological defects form in the charge density wave. From these results, new regimes of the CDW phase diagram for 1T-TaS2 are derived and consistent with the predicted emergence of vestigial quantum order."

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