An Optical System Defies Conventional Band Theory
June 10, 2021•
Physics 14, s70
Squeezed wave functions reshape an open quantum system’s bulk-boundary properties and generate a new class of parity-time symmetry.
L. Xiao
L. Xiao
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Quantum systems that obey parity-time symmetry exhibit “exceptional points” within their parameter space. In quantum optical systems, these are points where a light beam’s energy gains and losses are perfectly balanced, leading to rich critical phenomena, such as extreme sensitivity to external parameters. Parity-time symmetry can be engineered into systems via designs that ensure a balance of inward and outward energy flows (see Viewpoint:
PT Symmetry Goes Quantum). Now, Lei Xiao, at Beijing Computational Science Research Center, and colleagues demonstrate a new way to produce both parity-time symmetry and exceptional points in a quantum-optical circuit. Their study could allow tools for tuning exotic behavior in photonic, phon
Indian engineering student gets 25 international research offers Friday, April 2, 2021 IWK Bureau
The Covid pandemic has affected education all over the globe, but in midst of all this disruption, an Indian mechanical engineering student has drawn over two dozen research offers in both sciences and mathematics from top institutions in the US, the UK, Europe and elsewhere.
This is apart from the offers from leading Indian institutions, with many of which he has already collaborated on several key projects.
It is a rarity for students to receive research offers in both sciences and mathematics, but Abhishek Agrahari, 21, is one of the ones to qualify in this regard.
Indian engineering student gets 25 international research offers
By IANS |
Published on
Thu, Apr 1 2021 18:27 IST |
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Job. (File Photo: IANS). Image Source: IANS News
New Delhi, April 1 : The Covid pandemic has affected education all over the globe, but in midst of all this disruption, an Indian mechanical engineering student has drawn over two dozen research offers in both sciences and mathematics from top institutions in the US, the UK, Europe and elsewhere.
This is apart from the offers from leading Indian institutions, with many of which he has already collaborated on several key projects.
It is a rarity for students to receive research offers in both sciences and mathematics, but Abhishek Agrahari, 21, is one of the ones to qualify in this regard.
Predicting future mamalian hosts of SARS-CoV-2
Coronaviruses can infect both animals and humans. Coronavirus infections are common, and some strains are zoonotic, which means they can be transmitted between animals and humans.
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes the coronavirus disease (COVID-19), emerged in Wuhan City, China, in late December 2019. Though the exact animal reservoir of the virus is yet to be identified, scientists believe the virus came from a horseshoe bat and jumped to an intermediate host before making its way to the human population.
Researchers at the Beijing Computational Science Research Center and Peking University analyzed sequences of the angiotensin-converting enzyme 2 (ACE2) proteins from 16 mammals and predicted the structures of ACE2- receptor-binding domain (RBD) complexes.
Graphene gets a bandgap for opto-electronics
While graphene has some amazing physical, optical and mechanical properties, its lack of a natural bandgap limits its use in electronics.
Methods of varying complexity have been found to add bandgaps, and now there is another tool in the box – a chemical whose molecules self-assemble into an evenly-spaced flat lattice as they bond down into the graphene and give it a bandgap through sp2 to sp3 hybridisation.
Self-spacing is important, as it removes the fiddly task of externally guiding molecules into position to control the combined material’s electronic properties.
This “research is rather fundamental but could have repercussions over the next few years in optoelectronics, such as in the fabrication of photodetectors or in the field of solar energy”, according to Professor Federico Rosei of the Institut national de la recherche scientifique (INRS) in Canada, which was part of the academic consortium.