## Physicists just discovered another type of matter named Excitonium. **2 min read** https://res.cloudinary.com/hpiynhbhq/image/upload/v1516652842/b5ldzhqluqs6byaza74t.png *(Caption Image credit: CERN)* **Excitonium** was first theorized about 50 years ago when Harvard Theoretical Physicist **Prof. Bert Halperin** came up with the idea in 1960s to which he said *"If our understanding of quantum mechanics is correct, excitonium has to exist."* https://res.cloudinary.com/hpiynhbhq/image/upload/v1516654878/zvddf04qqn1jt6t1vvv4.jpg *(Harvard Theoretical Physicist Prof. Bert Halperin Image credit: Harvard)* Ever since Excitonium was theorized proving it's existence was extremely hard as scientists didn't had the right techniques to distinguish between Excitonium and another similar type of matter called Peierls phase. The way to prove it's existence was to know and prove all about how the electron moves around the nucleas of the atom. https://res.cloudinary.com/hpiynhbhq/image/upload/v1516653434/hyd92r796ugkwir7uj7j.jpg *(Peter Abbamonte (center) with graduate students Anshul Kogar (right) and Mindy Rak (left) at the Frederick Seitz Materials Research Laboratory. Photo by L. Brian Stauffer)* The research was conducted by **Peter Abbamonte** from the University of Illinois working with the graduate students **Anshul Kogar** and **Mindy Rak**. https://res.cloudinary.com/hpiynhbhq/image/upload/v1516653203/qc6afcgj77ghtvlhjjms.jpg *(Artist’s depiction of the collective excitons of an excitonic solid. These excitations can be thought of as propagating domain walls (yellow) in an otherwise ordered solid exciton background (blue). Image credit: Peter Abbamonte, University of Illinois)* Excitonium is a collection of particles that can exhibit quantum phenomenas like superconductivity, superfluidity or insulator on a macroscopic level. The group of particles that makes up excitonium are called excitons which are bosons the type of particles like photon, gluon, higgs boson. https://res.cloudinary.com/hpiynhbhq/image/upload/v1516653845/hmuqhszxloeucitlq9ic.gif *GIF showing the process of how exciton forms (GIF credit: Seeker)* Excitons are composite particles which is some particle made of two or more elementary particles. With Excitons it's a bit different, they’re made of an electron that has jumped to a higher energy level from the outermost shell of an atom with lots of other electrons and the shell of electrons with an escaped electron the empty space is behaved like a positive charged particle or like a positive hole, then the positive hole attracts the escaped electron back to it's place, when the two charges the positive charged hole and the electron meet they are an exciton.
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