When excited by an external stimulus (such as a laser pulse), a quantum dot can emit a single photon as the electron-hole pair recombines. Quantum dots can be fabricated using various semiconductor ...

However, two recent papers show that an even better bet could be the absence of one electron (known as hole) or more precisely its spin 1,2.

Black holes and neutron stars are among the densest ... the plasmas at these extreme conditions are known as relativistic electron-positron pair plasmas because they comprise a collection of ...