  The Luttinger model of the one-dimensional Fermi gas is the cornerstone of
modern understanding of interacting electrons in one dimension. In fact, the
enormous class of systems whose universal behavior is adiabatically connected
to it are now deemed Luttinger liquids. Recently, it has been shown that
metallic single-walled carbon nanotubes are almost perfectly described by the
Luttinger Hamiltonian. Indeed, strongly non-Fermi liquid behavior has been
observed in a variety of DC transport experiments, in very good agreement with
theoretical predictions. Here, we describe how fractional quasiparticle charge,
a fundamental property of Luttinger liquids, can be observed in
impurity-induced shot noise.
