  Explicit predictions for Scanning Tunneling Microscopy (STM) on interacting
one-dimensional electron systems are made using the Luttinger liquid formalism.
The STM current changes with distance from an impurity or boundary in a
characteristic way, which reveals the spin-charge separation and the
interaction strength in the system. The current exhibits Friedel-like
oscillations, but also carries additional modulated behavior as a function of
voltage and distance, which shows the spin-charge separation in real space.
Moreover, very close to the boundary the current is strongly reduced, which is
an indication of the interaction strength in the system.
