@hovden

Ph.D. Applied Physics, Materials Physics and Electron Microscopy https://xitter.cf/t.co/6aX5JySL4A

 Ann Arbor, MI
hovdenlab.com
Joined December 2008
  • Tweets721
  • Following202
  • Followers2.8K
126Media
Our article is online: Imaging of nanoscale polar textures in quantum paraelectric SrTiO3 nature.com/articles/s41586-0…

Imaging of nanoscale polar textures in quantum paraelectric SrTiO3

Nature - Cryo-STEM reveals that SrTiO3 forms periodic polar nanodomains below 105 K, but these fragment below 40 K, linking quantum paraelectricity to nanoscale polar ordering and...

nature.com
2
397
"Robert Hovden, an electron microscopist at the U. of Michigan, and his colleagues set out to create [an ultra-cold TEM]. They used a heat exchanger and other engineering tweaks to reduce vibrations from the liquid helium and obtain clearer images." nature.com/articles/d41586-0…

This super-cold microscope could spur a quantum revolution

Nature - The instrument, which operates near absolute zero for hours, will soon ship to a few labs. Researchers are thrilled.

nature.com
1
1
9
438
"Scientists have been on a decades-long quest to adapt some of their most powerful imaging instruments — transmission electron microscopes (TEMs) — to work at the coldest temperatures possible."
1
1
40
At minus 421 degrees, scientists capture structure of elusive chemical compound current.fas.harvard.edu/stor…
50
Robert Hovden retweeted
nature
@NatureSep 22
The device can image materials as low as about -266 degrees Celsius for 30 hours or more go.nature.com/4rtVRpt

This super-cold microscope could spur a quantum revolution

Nature - The instrument, which operates near absolute zero for hours, will soon ship to a few labs. Researchers are thrilled.

nature.com
1
7
1
29
23,283
Robert Hovden retweeted
nature
@NatureJul 28
Nature research paper: Imaging of nanoscale polar textures in quantum paraelectric SrTiO3 go.nature.com/4wfKOBH

Imaging of nanoscale polar textures in quantum paraelectric SrTiO3

Nature - Cryo-STEM reveals that SrTiO3 forms periodic polar nanodomains below 105 K, but these fragment below 40 K, linking quantum paraelectricity to nanoscale polar ordering and...

nature.com
4
9
50
31,890
Ein Metall aus Elektronen by Henri Wagner spektrum.de/news/ladungsdich…

Schmelzende Quantenkristalle: Ein Metall aus Elektronen

In bestimmten Materialien ordnen sich Elektronen zu Quantenkristallen, die sogar schmelzen können. Der Effekt könnte zukünftige Elektronik prägen. 

spektrum.de
103
How we imaged a quantum paraelectric: (a) Cool SrTiO3 with liquid helium. (b) Measure atomic polarity by using a sub-nanometer electron beam and detecting every scattered electron (c) Scan the electron beam and map the polarity at ultra-low temperatures.
1
2
158
Here is a comparison of SrTiO3 imaged at room temperature (300K) and below the quantum paraelectric phase transition (69K).
1
80
This work was enabled by the h-Bar Instruments Liquid Helium TEM stage and the Cornell EMPAD detector. The full manuscript is here: nature.com/articles/s41586-0…

Imaging of nanoscale polar textures in quantum paraelectric SrTiO3

Nature - Cryo-STEM reveals that SrTiO3 forms periodic polar nanodomains below 105 K, but these fragment below 40 K, linking quantum paraelectricity to nanoscale polar ordering and...

nature.com
1
43
Watched Factorial Energy founders (Ph.D.s in Chemistry) ring the Nasdaq bell. For the event they hauled next generation battery vehicles onto the middle of Times Square. Massive images of batteries displayed on buildings.
130
Robert Hovden retweeted
Factorial
@FactorialEnergyJun 17
Years of work. One unforgettable morning. Today, the Factorial team rang the @Nasdaq Opening Bell as we celebrated our next milestone as a public company, trading under $FAC and $FACWW. Proud of the team, the progress, and the partnerships that made this moment possible. The next chapter starts now.
5
23
1
147
2,580,156
Our article online: Melting point depression of the charge density wave in 1⁢𝑇⁢−Ti⁢Se2 due to size effects journals.aps.org/prb/abstrac…

Melting point depression of the charge density wave in $1T\text{\ensuremath{-}}\mathrm{Ti}{\mathr...

In correlated electronic states, observation of size-dependent nucleation and melting is rarely reported, likely due to the extremely small length scales necessary to observe such effects for...

journals.aps.org
1
153
CDW melting in 1⁢𝑇⁢-Ti⁢Se2 nanoflake by electron diffraction. BF-TEM image of a nanoflake (dotted outline) with corresponding nanobeam electron diffraction patterns at different temperatures. Black arrows highlight prominent CDW peaks that disappear at higher temperatures. The overlapping nanoflakes in the BF-TEM image were separated by assuming each nanoflake has a convex shape. The concave points in the image were identified as junctions where these nanoflakes overlap. Scale bars for BF-TEM image=100nm for diffraction patterns=2n⁢m−1. Liquid helium specimen stage by h-Bar Instruments.
1T-TiSe2 electron diffraction measured using specimen stage by h-Bar Instruments

ALT 1T-TiSe2 electron diffraction measured using specimen stage by h-Bar Instruments

133
Game Genie represents one of my favorite copyright cases: Galoob v. Nintendo. The Ninth Circuit ruled game genie to be kaleidoscope.
1
157
Galoob v. Nintendo said altering gameplay in RAM wasn’t an illegal derivative work (despite RAM being fixed and tangible). You could bend a game you bought, privately, without making or distributing a new permanent copy. A cheat device became a right-to-tinker landmark.
1
120
It introduced the kaleidoscope argument: A kaleidoscope pointed at a painting can change how you experience a copyrighted work without creating a new infringing work. Game Genie is a kaleidoscope.
90
Liquid Helium CryoEM at Imperial, London.
3
317
Oxidized titanium (aqueous electrolytic process) provides a natural colormap. Photo taken at Imperial College London.
97
Load more