Tunneling spectroscopy of a ballistic quantum wire

We implement a tunneling-spectroscopy experiment on a ballistic quantum wire by modifying the split-gate method to realize a wire in which an external reservoir can be used to inject tunneling electrons into its interior. We observe a number of features in the tunnel signal of these structures, including a pronounced response associated with the one-dimensional density of states of the wire, as well as signatures of coherent interference of the injected electrons, and dephasing introduced by tunneling of electrons between the wire and the external reservoir.