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A seemingly unattainable energy transition -- ScienceDaily
Science News from research organizations 1 . 2 . A seemingly unattainable energy transition . Date: November 24, 2021 Source: Ruhr-University Bochum Summary: Researchers have managed to address an unusual energy transition in a semiconductor. Share: FULL STORY Researchers from Basel and Bochum have succeeded in addressing an apparently unattainable energy transition in an artificial atom using laser light. Making use of the so-called radiative Auger process, they were the first team to specifically excite it. In this process, an electron falls from a higher to a lower energy level and, as a result, emits its energy partly in the form of light and partly by transferring it to another electron. The artificial atoms are narrowly defined areas in semiconductors that could one day form the basis for quantum communication. The findings are described by the team from the University of Basel and Ruhr-Universit?t Bochum together with colleagues from Münster and Wroclaw in " Nature Communications ," published online on 12 November 2021. advertisement Electrons move between energy states Atoms consist of a nucleus and electrons that travel around the nucleus. These electrons can assume different energy levels. Electrons that are more tightly bound to the nucleus, i.e. closer to it, have a lower energy than electrons that are further away from the nucleus. However, the electrons can't assume any arbitrary energy levels -- only certain levels are possible. If an electron acquires energy, for example by absorbing a light particle, i.e. photon, it can be raised to a higher energy level. If an electron falls to a lower energy level, energy is released. This energy can be emitted in the form of a photon. But it can also be transferred to one of the other electrons; in this case, only some of the energy is released as light, the rest is absorbed by the other electron. This process is known as the radiative Auger process. Exciting a unique energy transition with two lasers By irradiating light particles, electrons can not only be lifted to a higher energy level; they can also be stimulated to give off energy by an incident light particle. The energy of the incident light particle must always correspond exactly to the difference in the two energy levels between which the electron is to be transferred. The researchers have used two lasers: one moved electrons between a low and a high energy level; the other between the high and a medium energy level. This middle energy level corresponds to a non-equilibrium level: the transfer to the middle level doesn't exist without a radiative Auger process. In addition, a transition between the low and the medium energy level shouldn't have occurred, because the relevant light was not irradiated. However, precisely this seemingly impossible transition occurred in reality due to the energy transfer from one electron to another in the radiative Auger process. The ultrapure semiconductor samples for the experiment were produced by Dr. Julian Ritzmann at Ruhr-Universit?t Bochum under the supervision of Dr. Arne Ludwig at the Chair for Applied Solid State Physics headed by Professor Andreas Wieck. The measurements were carried out by a team from the University of Basel run by Clemens Spinnler, Liang Zhai, Giang Nguyen and Dr. Matthias L?bl in the group headed by Professor Richard Warburton. make a difference: sponsored opportunity Story Source: Materials provided by Ruhr-University Bochum . Note: Content may be edited for style and length. Journal Reference : Clemens Spinnler, Liang Zhai, Giang N. Nguyen, Julian Ritzmann, Andreas D. Wieck, Arne Ludwig, Alisa Javadi, Doris E. Reiter, Pawe? Machnikowski, Richard J. Warburton, Matthias C. L?bl. Optically driving the radiative Auger transition . Nature Communications , 2021; 12 (1) DOI: 10.1038/s41467-021-26875-8 . Cite This Page : MLA . APA . Chicago . Ruhr-University Bochum. "A seemingly unattainable energy transition." ScienceDaily. ScienceDaily, 24 November 2021. . Ruhr-University Bochum. (2021, November 24). A seemingly unattainable energy transition. ScienceDaily . Retrieved December 1, 2021 from www.sciencedaily.com/releases/2021/11/211124154035.htm Ruhr-University Bochum. "A seemingly unattainable energy transition." ScienceDaily. www.sciencedaily.com/releases/2021/11/211124154035.htm (accessed December 1, 2021). RELATED TOPICS Computers & Math Spintronics Research . Artificial Intelligence . Communications . Computer Graphics . advertisement RELATED TERMS Quantum dot . Silicon . Scientific method . Morphing . Blue Gene . Telecommunication . Robot . 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