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Tunneling and nonlinear transport in a vertically coupled GaAs/AlGaAs double quantum wire system

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4 Author(s)
Bielejec, E. ; Sandia National Laboratories, Albuquerque, New Mexico 87185 ; Seamons, J.A. ; Reno, J.L. ; Lilly, M.P.

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We report low-dimensional tunneling in an independently contacted vertically coupled quantum wire system. This nanostructure is fabricated in a high quality GaAs/AlGaAs parallel double quantum well heterostructure. Using a unique flip chip technique to align top and bottom split gates to form low-dimensional constrictions in each of the independently contacted quantum wells we explicitly control the subband occupation of the individual wires. In addition to the expected two-dimensional (2D)-2D tunneling results, we have found additional tunneling features that are related to the one-dimensional quantum wires.

Published in:

Applied Physics Letters  (Volume:86 ,  Issue: 8 )