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Phys. Rev. B 78, 035335 (2008) [5 pages]

Tunneling spectroscopy of a ballistic quantum wire

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A. Ramamoorthy1, L. Mourokh2, J. L. Reno3, and J. P. Bird4
1Nanostructures Research Group, Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287-5706, USA
2Department of Physics, Queens College of CUNY, 65-30 Kissena Boulevard, Flushing, New York 11367, USA
3CINT Science Department, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1303, USA
4Department of Electrical Engineering, University at Buffalo, Buffalo, New York 14260, USA

Received 3 April 2008; revised 19 June 2008; published 30 July 2008

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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.035335
DOI:
10.1103/PhysRevB.78.035335
PACS:
73.23.Ad, 73.63.Nm, 73.40.Gk
 
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