Subdeacon Joe Posted November 20, 2014 Share Posted November 20, 2014 As Spock would say. Excitonic Dark Matter. Using two-photon excitation spectroscopy, the researchers probed monolayers of tungsten disulfide, one of the most promising of 2D materials, and found evidence for the existence of excitonic dark states – energy states in which single photons can be neither absorbed nor emitted. These excitons were predicted from ab initio calculations by members of the research team to have an unusual energy sequence, plus excitonic binding energy and bandgaps that are far larger than was previously suspected for 2D TMDC materials. ADDED Also of interest. Rice scientists led the first single-step growth of self-assembled hybrid layers made of two elements that can either be side by side and one-atom thick or stacked atop each other. The structure’s final form can be tuned by changing the growth temperature. The discovery reported online this week in Nature Materials could lead to what Rice materials scientist Pulickel Ajayan calls “pixel engineering”: atomically thin semiconductors with no limit to their potential for use in optoelectronic devices. This image shows the interface between elements of the in-plane material created by scientists at Rice University and their colleagues. Tungsten disulfide (orange) and molybdenum disulfide (blue) molecules self assemble into either single- or multiple-layer materials, depending on growth temperature. (Credit: Yongji Gong and Junhao Lin) Link to comment Share on other sites More sharing options...
Dawg Hair, SASS #29557 Posted November 20, 2014 Share Posted November 20, 2014 AHA! This explains it! A couple of months ago we acquired (what we thought was) a two months old, all black (not a single speck of any other color anywhere), female Cocker Spaniel. Now after dozens of attempts to photograph her I believe that what we got was really a black hole! Because all, or the majority of, photons generated by the camera flash are absorbed by her fur with very, very few bouncing back to the camera lens This makes it nearly impossible to obtain an identifiable image other than just a black form in the middle of the picture. She also lunges for my nose all the time and I have to keep touching it to reasure myself that my nasal appendage has not disappeared into the void! On the positive side, she is a major chick magnet! Link to comment Share on other sites More sharing options...
Hardpan Curmudgeon SASS #8967 Posted November 20, 2014 Share Posted November 20, 2014 I will never eat Kandy Korn again... Link to comment Share on other sites More sharing options...
Charlie Harley, #14153 Posted November 20, 2014 Share Posted November 20, 2014 Kinda looks like a bunch of 5.56 tracer ammo all stacked together. Link to comment Share on other sites More sharing options...
Utah Bob #35998 Posted November 20, 2014 Share Posted November 20, 2014 Made my head hurt. Link to comment Share on other sites More sharing options...
Badlands Bob #61228 Posted November 21, 2014 Share Posted November 21, 2014 If I understand this, I think where they are heading is the ability to make electronic contraptions 1 atom thick. Things like computer brains can be much smaller and control much smaller devices. Like injecting tiny robots into your body to fix stuff without having to open you up. Sure, it's science fiction now, but give it a few years. Look how fast computers evolved. Link to comment Share on other sites More sharing options...
Badger Mountain Charlie SASS #43172 Posted November 21, 2014 Share Posted November 21, 2014 WELL, I FOR ONE, WILL SLEEP MUCH BETTER TONIGHT, KNOWING THAT RICE SCIENTIST ARE MAKING MORE DARK. With the winter solstice just around the corner we will soon be loosing dark at an alarming rate. And the government has no program to prolong darkness. Oh wait, maybe they do.... Link to comment Share on other sites More sharing options...
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