Linker IT Software
menubar-top-links menubar-top-rechts
Home Help Search Login
Welcome, Guest. Please Login.
SQL*XL: Database to Excel bridge litLIB: Excel power functions pack ExcelLock: Locking and securing your valuable Excel spreadsheets encOffice: Protect your Excel file easy and safe encOffice: Protect your Excel file easy and safe
Pages: 1
Mott transition (Read 3958 times)
Gerrit-Jan Linker
YaBB Administrator

Posts: 75
Mott transition
27.05.09 at 12:55:42
Mott transition
A Mott transition is a metal-nonmetal transition in condensed matter.
It is an example where the theory of the Landau liquid (electron liquid) does not apply anymore. This is where Epotential / Ekinetic if far greater than 1.
Due to electric field screening the potential energy becomes much sharper peaked around the equilibrium position of the atom and electrons become localized and can no longer conduct a current.
In a semiconductor at low temperatures, each 'site' (atom or group of atoms) contains a certain number of electrons and is electrically neutral. For an electron to move away from a site requires a certain amount of energy, as the electron is normally pulled back toward the (now positively charged) site by Coulomb forces. If the temperature is high enough that of energy is available per site, the Boltzmann distribution predicts that a significant fraction of electrons will have enough energy to escape their site, leaving an electron hole behind and becoming conduction electrons that conduct current. The result is that at low temperatures a material is insulating, and at high temperatures the material conducts.
The Mott transition is the point in between. Mott argued that the transition must be sudden, occurring when the density of free electrons N and the Bohr radius satisfies .
See also:
Mott insulator
Electron gas, electron liquid, electron crystal
Back to top
« Last Edit: 12.10.12 at 08:47:55 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
Linker IT Software
Email WWW Gerrit-Jan Linker   IP Logged
Pages: 1