In the mid-1920s, two absolute giants in the world of physics, Satyendra Nath Bose and
Fast-forward some 70 years later, scientists from the University of Colorado at Boulder proved Einstein and Bose correct. Since then, BECs have been a vital tool for exploring the quantum properties of atoms, and a series of advancementswhether getting the particles even cooler or getting them to form diatomic moleculeshave made them more and more useful in the search for the underlying physics that governs the universe.
Now, physicists from Columbia Universityin collaboration with Radboud University in the Netherlandstook the next step of this century-long BEC journey by creating a sodium-cesium condensate thats only five nanoKelvin above absolute zero. While thats an impressively cold temperature, the most important part of this impressive piece of experimental physics is that the resulting BEC is dipolar, meaning it has both a positive and a negative charge. The team utilized a previously peer-reviewed technique that uses microwaves to cross the BEC threshold, according to a press statement. The results of this study were published this week in the journal Nature.
By controlling these dipolar interactions, we hope to create new quantum states and phases of matter, Columbia postdoc Ian Stevenson, a co-author of the study, said in a press statement.
Microwaves are usually associated with heating things up, but study collaborator Tijs Karman from Radboud University suggested that microwaves can act like shields and essentially protect molecules from lossy collisions while hot molecules are removed from a sample, which has an overall cooling effect. The team tried the microwave technique in 2023, but this new study added a second microwave field that proved more effective at creating the desired BEC.
We really have a good idea of the interactions in this system, which is also critical for the next steps, like exploring dipolar many-body physics, Karman, who was also a co-author of the study, said in a press statement. Weve come up with schemes to control interactions, tested these in theory, and implemented them in the experiment. Its been really an amazing experience to see these ideas for microwave shielding being realized in the lab.
The creation of this dipolar BEC opens the door to the creation of many other forms of exotic matter, such as exotic dipolar droplets, self-organized crystal phases, and dipolar spin liquids in optical lattices, according to the paper. But those are only a few of the dozens of possible applications that this new BEC could help realize. Because this experiment enables precise control over quantum interactionsaccording to Jun Ye, an ultracold scientist at UC-Boulderthe impacts on quantum chemistry could also be pretty profound.
The universes little-known fifth state of matter continues to surprise us more than a century after its startling introduction into the known world of physics.
Darren lives in Portland, has a cat, and writes/edits about sci-fi and how our world works. You can find his previous stuff at Gizmodo and Paste if you look hard enough.
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