Your source for the latest research news

Tuesday, 23 June 2020

Measuring a tiny quasiparticle is a major step forward for semiconductor technology


A team of researchers led by Sufei Shi, an assistant professor of chemical and biological engineering at Rensselaer Polytechnic Institute, has uncovered new information about the mass of individual components that make up a promising quasiparticle, known as an exciton, that could play a critical role in future applications for quantum computing, improved memory storage, and more efficient energy conversion.



Published today in Nature Communications, the team's work brings researchers one step closer to advancing the development of semiconductor devices by deepening their understanding of an atomically thin class of materials known as transitional metal dichalcogenides (TMDCs), which have been eyed for their electronic and optical properties. Researchers still have a lot to learn about the exciton before TMDCs can successfully be used in technological devices.

Shi and his team have become leaders in that pursuit, developing and studying TMDCs, and the exciton in particular. Excitons are typically generated by energy from light and form when a negatively charged electron bonds with a positively charged hole particle.

The Rensselaer team found that within this atomically thin semiconductor material, the interaction between electrons and holes can be so strong that the two particles within an exciton can bond with a third electron or hole particle to form a trion.

In this new study, Shi's team was able to manipulate the TMDCs material so the crystalline lattice within would vibrate, creating another type of quasiparticle known as a phonon, which will strongly interact with a trion. The researchers then placed the material within a high magnetic field, analyzed the light emitted from the TMDCs from the phonon interaction, and were able to determine the effective mass of the electron and hole individually.

Researchers previously assumed there would be symmetry in mass, but, Shi said, the Rensselaer team found these measurements were significantly different.

"We have developed a lot of knowledge about TMDCs now," Shi said. "But in order to design an electronic or optoelectronic device, it is essential to know the effective mass of the electrons and holes. This work is one solid step toward that goal."



More information: 

Zhipeng Li et al. Phonon-exciton Interactions in WSe2 under a quantizing magnetic field, Nature Communications (2020). DOI: 10.1038/s41467-020-16934-x

4 comments:

  1. I have been suffering from (HERPES) disease for the last four years and had constant pain, especially in my knees. During the first year, I had faith in God that I would be healed someday.This disease started to circulate all over my body and I have been taking treatment from my doctor, a few weeks ago I came on search on the internet if I could get any information concerning the prevention of this disease, on my search I saw a testimony of someone who has been healed from (Hepatitis B and Cancer) by this Man Dr. Silver and she also gave the email address of this man and advise we should contact him for any sickness that he would be of help, so I wrote to Dr. Silver telling him about my (HERPES Virus) he told me not to worry that I was going to be cured!! hmm i never believed it,, well after all the procedures and remedy given to me by this man few weeks later I started experiencing changes all over me as the Dr. assured me that I have cured, after some time i went to my doctor to confirmed if I have been finally healed behold it was TRUE, So friends my advice is if you have such sickness or any other at all you can email Dr. Silver (drsilverhealingtemple@gmail.com) sir I am indeed grateful for the help I will forever recommend you to my friends!!! with your lovely Email Address ( drsilverhealingtemple@gmail.com

    ReplyDelete
  2. I have been suffering from (HERPES) disease for the last four years and had constant pain, especially in my knees. During the first year, I had faith in God that I would be healed someday.This disease started to circulate all over my body and I have been taking treatment from my doctor, a few weeks ago I came on search on the internet if I could get any information concerning the prevention of this disease, on my search I saw a testimony of someone who has been healed from (Hepatitis B and Cancer) by this Man Dr. Silver and she also gave the email address of this man and advise we should contact him for any sickness that he would be of help, so I wrote to Dr. Silver telling him about my (HERPES Virus) he told me not to worry that I was going to be cured!! hmm i never believed it,, well after all the procedures and remedy given to me by this man few weeks later I started experiencing changes all over me as the Dr. assured me that I have cured, after some time i went to my doctor to confirmed if I have been finally healed behold it was TRUE, So friends my advice is if you have such sickness or any other at all you can email Dr. Silver (drsilverhealingtemple@gmail.com) sir I am indeed grateful for the help I will forever recommend you to my friends!!! with your lovely Email Address ( drsilverhealingtemple@gmail.com

    ReplyDelete
  3. Am Laura Mildred by name, i was diagnosed with Herpes 4 years ago i lived in pain with the knowledge that i wasn't going to ever be well again i contacted so many herbal doctors on this issue and wasted a large sum of money but my condition never got better i was determined to get my life back so one day i saw Mr. Morrison Hansen post on how Dr. Emu saved him from Herpes with herbal medicine i contacted Dr. Emu on his Email: Emutemple@gmail.com we spoke on the issue i told him all that i went through and he told me not to worry that everything will be fine again so he prepared the medicine and send it to me and told me how to use it, after 14 days of usage I went to see the doctor for test,then the result was negative, am the happiest woman on earth now thanks to Dr. Emu God bless you. Email him at: Emutemple@gmail.com Whats-app or Call him +2347012841542 

    ReplyDelete
  4. Am Laura Mildred by name, i was diagnosed with Herpes 4 years ago i lived in pain with the knowledge that i wasn't going to ever be well again i contacted so many herbal doctors on this issue and wasted a large sum of money but my condition never got better i was determined to get my life back so one day i saw Mr. Morrison Hansen post on how Dr. Emu saved him from Herpes with herbal medicine i contacted Dr. Emu on his Email: Emutemple@gmail.com we spoke on the issue i told him all that i went through and he told me not to worry that everything will be fine again so he prepared the medicine and send it to me and told me how to use it, after 14 days of usage I went to see the doctor for test,then the result was negative, am the happiest woman on earth now thanks to Dr. Emu God bless you. Email him at: Emutemple@gmail.com Whats-app or Call him +2347012841542 

    ReplyDelete