bose-einstein condensate - BLOGS - Blacksciencefictionsociety2024-03-29T12:30:04Zhttps://blacksciencefictionsociety.com/profiles/blogs/feed/tag/bose-einstein+condensateVortex Beams...https://blacksciencefictionsociety.com/profiles/blogs/vortex-beams2021-10-19T10:00:00.000Z2021-10-19T10:00:00.000ZReginald L. Goodwinhttps://blacksciencefictionsociety.com/members/ReginaldLGoodwin<div><p><a href="{{#staticFileLink}}9713631075,RESIZE_930x{{/staticFileLink}}"><img class="align-center" src="{{#staticFileLink}}9713631075,RESIZE_710x{{/staticFileLink}}" width="710" alt="9713631075?profile=RESIZE_710x" /></a></p><p style="text-align:center;"><span style="font-size:8pt;">This calculated diffraction image shows how forked diffraction gratings shape the atoms' wave function into a vortex. (Courtesy: Science/AAAS)</span></p><p><span class="font-size-3"><span style="font-family:georgia, palatino;">Topics: Bose-Einstein Condensate, Nanotechnology, Particle Physics, Quantum Optics</span></span></p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>A <a href="https://physicsandnano.com/2021/10/19/vortex-beams/" target="_blank">wave-like property</a> previously only seen in beams of light and electrons has been observed for the first time in atoms and molecules. By passing beams of helium and neon through a grid of specially shaped nanoslits, researchers led by <a href="https://www.weizmann.ac.il/chembiophys/edn/home" target="_blank">Edvardas Narevicius</a> of Israel’s Weizmann Institute of Science succeeded in giving the beams a non-zero orbital angular momentum (OAM). The resulting structures are known vortex beams, and they could be used for fundamental physics studies such as probing the internal structure of protons.</em></span></span></p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>Many natural systems contain vortices – think of tornadoes and ocean eddies on Earth, the red spot on Jupiter, and gravitational vortices around black holes. On all scales, such vortices are characterized by the circulation of a flux around an axis. In the quantum world, these swirling structures are found in ensembles of particles that can be described by a wavefunction, including superfluids and Bose-Einstein condensates.</em></span></span></p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><a href="https://physicsworld.com/a/atoms-and-molecules-make-vortex-beams/" target="_blank">Atoms and molecules make vortex beams</a>, Isabelle Dumé, Physics World</span></span></p></div>Nano Laser...https://blacksciencefictionsociety.com/profiles/blogs/nano-laser2021-06-16T10:00:00.000Z2021-06-16T10:00:00.000ZReginald L. Goodwinhttps://blacksciencefictionsociety.com/members/ReginaldLGoodwin<div><p><a href="{{#staticFileLink}}9096373252,RESIZE_584x{{/staticFileLink}}"><img class="align-center" src="{{#staticFileLink}}9096373252,RESIZE_584x{{/staticFileLink}}" width="556" alt="9096373252?profile=RESIZE_584x" /></a></p><p style="text-align:center;"><span style="font-size:8pt;">In their experiments, the researchers used ultrathin crystals consisting of a single layer of atoms. These sheets were sandwiched between two layers of mirror-like materials. The whole structure acts as a cage for light and is called a microcavity.</span></p><p></p><p><span class="font-size-3"><span style="font-family:georgia, palatino;">Topics: Applied Physics, Bose-Einstein Condensate, Lasers, Nanotechnology, Optics</span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>Physicists have taken a step towards realizing the <a href="https://physicsandnano.com/2021/06/16/nano-laser/" target="_blank">smallest-ever solid-state laser</a> by generating an exotic quantum state known as a Bose-Einstein condensate (BEC) in quasiparticles consisting of both matter and light. Although the effect has so far only been observed at ultracold temperatures in atomically thin crystals of molybdenum diselenide (MoSe<sub>2</sub>), it might also be produced at room temperature in other materials.</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>When particles are cooled down to temperatures just above absolute zero, they form a BEC – a state of matter in which all the particles occupy the same quantum state and act in unison, like a superfluid. A BEC made up of tens of thousands of particles behaves as if it were just one giant quantum particle.</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>An international team of researchers led by <a href="https://uol.de/en/physik/forschung/forschungsgebiete/standard-titel/personen" target="_blank">Carlos Anton-Solanas and Christian Schneider from the University of Oldenburg, Germany</a>; <a href="https://www.physik.uni-wuerzburg.de/tep/startseite/" target="_blank">Sven Höfling of the University of Würzburg, Germany</a>; <a href="https://faculty.engineering.asu.edu/tongay/" target="_blank">Sefaattin Tongay at Arizona State University, US</a>; and <a href="https://en.westlake.edu.cn/academics/School_of_Science/Physics/Our_Faculty/201912/t20191206_2488.shtml" target="_blank">Alexey Kavokin of Westlake University in China</a>, has now generated a BEC from quasiparticles known as exciton-polaritons in atomically thin crystals. These quasiparticles form when excited electrons in solids couple strongly with photons.</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>“Devices that can control these novel light-matter states hold the promise of a technological leap in comparison with current electronic circuits,” explains Anton-Solanas, who is in the quantum materials group at Oldenburg’s Institute of Physics. “Such optoelectronic circuits, which operate using light instead of electric current, could be better and faster at processing information than today’s processors.”</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>Anton-Solanas, Schneider, and colleagues studied crystals of MoSe<sub>2</sub> that were just a single atomic layer thick. MoSe<sub>2</sub>belongs to a family of materials known as transition-metal dichalcogenides (TMDCs). In their bulk form, these materials act as indirect band-gap semiconductors. Still, when scaled down to a monolayer thickness, they behave as direct band-gap semiconductors, capable of efficiently absorbing and emitting light.</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><em>In their experiments, the researchers assembled sheets of MoSe<sub>2</sub> less than a nanometer thick and sandwiched them between alternating layers of silicon dioxide and titanium dioxide (SiO<sub>2</sub>/TiO<sub>2</sub>), which reflect light like a mirror. The resulting structure is known as a microcavity and acts as a cage for light. “It’s like trapping the light-emitting material in a room filled with mirrors and mirrors only,” Tongay tells <strong>Physics World.</strong> “The light gets reflected these mirrors and is absorbed by the material back and forth.”</em></span></span></p><p> </p><p><span class="font-size-3"><span style="font-family:georgia, palatino;"><a href="https://physicsworld.com/a/exotic-quantum-state-could-make-smallest-ever-laser/" target="_blank">Exotic quantum state could make smallest-ever laser</a>, Isabelle Dumé, Physics World</span></span></p><p></p></div>