Around 50 years have passed from the first time scientists theorized about this аand now they have finally proven the existence of “excitonium”, a new form of matter.
This form of matter is made from particles that are commonly known as excitons which are made from an escaped electron and the hole it lefts behind it.
The scientists that conducted this experiment say that they could observe the material and the precursor phase and that’s a solid proof of the existence of this new form of matter.
When an electron escapes, it always leaves a hole behind it.
And with a positive charge, this hole can somehow behave like it is a particle itself. The hole attracts the electron while pairing them to a form of a composite particale, commonly known as an exciton.
The scientists have studied non-doped crystals of the transition metal known as 1T-TiSe2 – dichalcogenide titanium diselenide.
The crew from the University of Illinois College of Engineering was able to reproduce the results 5 times on different cleaved crystals.
In the past, researches had a hard time distinguishing the material from what’s known as a Peierls phase, but in order to uncover the elusive form of matter, they have developed a brand new technique that is called momentum-resolved electron energy-loss spectroscopy and this technique is far more sensitive to excitations than any other possible methods.