MAGNETOTRANSPORT SPECTROSCOPY ON A QUANTUM-WIRE

One-dimensional structures are expected to show unique electronic tran sport behavior as a consequence of the Coulomb interaction between car riers. A considerable number of theoretical predictions remain largely untested by experiment due to a lack of a suitable one-dimensional wi re. Using a new crystal growth technique a unique tube-like structure with a cross section of 25 nmx25 nm has been created in a semiconducto r. The mean Gee path of the electrons exceeds 10 mu m - more than 400 times the confinement dimension. The energy spacing between one-dimens ional modes far exceed any random potential fluctuations and is more t han 10 times larger than previously achieved by other techniques. The conductance plateaus of these wires deviate significantly from the exp ected universal values suggesting the relevance of electron-electron i nteractions. Copyright (C) 1996 Published by Elsevier Science Ltd.