# Fermi energy

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## Fermi level

n
(General Physics) the level in the distribution of electron energies in a solid at which a quantum state is equally likely to be occupied or empty
[C20: named after Enrico Fermi]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
where [v.sub.F] is the Fermi velocity, a = 0.386 nm the lattice constant, and [k.sub.[+ or -]] = [k.sub.x] [+ or -] i[k.sub.y].
These electrons travel freely on average by a distance called electron mean free path equal to l = [[upsilon].sub.F][tau], where [[upsilon].sub.F] is the Fermi velocity.
where the [v.sub.F] [approximately equal to] 1 x [10.sup.6] m x [s.sup.-1] is the Fermi velocity [5] and h is the reduced Planck constant.
where [V.sub.F] is a kind of Fermi velocity of the system and solving for [V.sub.F], we find after using equations (6) and (8)
where [DELTA] = V/2 is the bias voltage, k is the wave vector, [alpha] = (V/[t.sup.2.sub.[perpendicular to]])[v.sup.2.sub.F], [beta] = [v.sup.4.sub.F]/V[t.sup.2.sub.[perpendicular to]], [v.sub.F] = 3t x [a.sub.c-c]/2 is the Fermi velocity, and [a.sub.c-c] = 1.41 [Angstrom] is the lattice-spacing [25-28].
It is also interesting to write formulas for the Fermi velocity [v.sub.F] and the electron mean free path l.
Schmitt et al., "Doping-dependent nodal fermi velocity of the high-temperature superconductor [Bi.sub.2][Sr.sub.2]Ca[Cu.sub.2][O.sub.8+[delta]] revealed using high-resolution angle resolved photoemission spectroscopy," Physical Review Letters, vol.
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