Scanning tunneling microscope (STM) picture of a nanowire one
atom wide and about 150 atoms long. The elevation denotes the local electron density
as measured by the STM probe. A charge density wave, in the form of a standing wave,
is evident. At times the quasiparticle representation of the charge density wave
behaves as if it had a fractional spin and a fractional charge.
Snijders et al.
in Physical Review Letters, 24 February 2006
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