Padma Kant Shukla, Bengt Eliasson
We report new attractive force between ions that are shielded by degenerate
electrons in quantum plasmas. Specifically, we show that the electric potential
around an isolated ion has a hard core negative part that resembles the
Lennard-Jones (LJ)-type potential. Physically, the new electric potential is
attributed to the consideration of the quantum statistical pressure, the
quantum Bohm potential, as well as the electron exchange and electron
correlations due to electron-1/2 spin within the framework of the quantum
hydrodynamical description of quantum plasmas. The shape of the attractive
potential is determined by the ratio between the Bohr radius and the
Wigner-Seitz radius of degenerate electrons. The existence of the hard core
negative potential will be responsible for the attraction of ions forming
lattices and atoms/molecules, as well as for critical points and phase
transitions in quantum plasmas at nanoscales.
View original:
http://arxiv.org/abs/1112.5556
No comments:
Post a Comment