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fermion
noun
(particle
physics,
Standard
Model)
Any
elementary
or
composite
particle
that
has
half-integer
spin
and
thus
obeys
Fermi–Dirac
statistics
and
the
Pauli
exclusion
principle
(equivalently,
a
particle
for
which
the
wavefunction
of
any
system
of
identical
such
particles
changes
sign
whenever
two
are
swapped);
a
baryon,
a
lepton
or
a
quark;
Fermiology
Weyl fermion
noun
(electronics,
quantum
mechanics)
A
massless
quasiparticle
and
fermion,
which
carries
electric
charge,
and
cannot
move
backwards,
that
may
exist
in
Weyl
semimetals,
where
an
electron
can
be
split
into
two
Weyl
fermions
which
move
in
opposite
directions,
which
can
form
an
electron
by
combining
two
Weyl
fermions.