New form of matter ‘excitonium’ discovered

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Mains Paper 3: Science & Technology | Awareness in the fields of IT, Space, Computers, robotics, nano-technology, bio-technology

From UPSC perspective, the following things are important:

Prelims level: Excitonium, bosons

Mains level: Discovery and its details can be asked in Mains


News

Scientists prove the existence of new form of matter

  1. Existence of Excitonium – which was first theorized almost 50 years ago, has been proved by scientists
  2. This has been done by studying non-doped crystals of a transition metal— dichalcogenide titanium diselenide (1T-TiSe2)

About Excitonium

  1. Excitonium exhibits macroscopic quantum phenomena, like a superconductor
  2. It is made up of excitons, particles that are formed in a very strange quantum mechanical pairing

How is exciton formed?

  1. When an electron, seated at the edge of the crowded-with-electrons valence band in a semiconductor, gets excited and jumps over the energy gap to the otherwise empty conduction band, it leaves behind a “hole” in the valence band
  2. That hole behaves as though it were a particle with positive charge, and it attracts the escaped electron
  3. When the escaped electron with its negative charge, pairs up with the hole, the two remarkably form a composite particle, a boson – an exciton
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