N. E. Lumpkin
University of New South Wales
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Publication
Featured researches published by N. E. Lumpkin.
Applied Physics Letters | 1998
Bridget Kane; G.R. Facer; Andrew S. Dzurak; N. E. Lumpkin; R. G. Clark; L. N. Pfeiffer; K. W. West
We describe quantum wires and point contacts fabricated in GaAs/AlxGa1−xAs heterostructures that are free of the disorder introduced by modulation doping and in which the electron density and the confining potential are separately adjustable by lithographically defined gates. We observe conductance plateaus quantized near even multiples of e2/h in 2 μm wires and up to 15 conductance steps in 5 μm wires at temperatures below 1 K. Near the conductance threshold the quantum point contact and the 2 μm wire both show additional structure below 2e2/h.
Physical Review B | 2001
D. J. Reilly; G.R. Facer; Andrew S. Dzurak; B. E. Kane; R. G. Clark; P. J. Stiles; A. R. Hamilton; J. L. O’Brien; N. E. Lumpkin; L. N. Pfeiffer; K. W. West
Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to
Nanotechnology | 2002
T. M. Buehler; Rita P. McKinnon; N. E. Lumpkin; R. Brenner; D. J. Reilly; Linda D. Macks; A. R. Hamilton; Andrew S. Dzurak; R. G. Clark
0.7\ifmmode\times\else\texttimes\fi{}{2e}^{2}/h
Physical Review B | 2000
J. L. O’Brien; Hiroshi Nakagawa; Andrew S. Dzurak; R. G. Clark; Bridget Kane; N. E. Lumpkin; R.P. Starrett; N. Muira; E. E. Mitchell; Jeffrey D. Goettee; Dwight G. Rickel; J. S. Brooks
in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra low-disorder
Smart Materials and Structures | 2002
Rita P. McKinnon; Fay E. Stanley; N. E. Lumpkin; E. Gauja; Linda D. Macks; Mladen Mitic; Victor Chan; Katia Peceros; T. M. Buehler; Andrew S. Dzurak; R. G. Clark; Changyi Yang; D.N. Jamieson; Steven Prawer
\mathrm{GaAs}/{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}
Physica B-condensed Matter | 1998
B Zhang; J. S. Brooks; Z. Wang; Jaaj Perenboom; Jerry A. Simmons; John L. Reno; N. E. Lumpkin; Jeremy L. O'Brien; R. G. Clark
quantum wires with nominal lengths
Semiconductor Science and Technology | 2000
R.J. Heron; R. A. Lewis; R. G. Clark; R.P. Starrett; B. E. Kane; G.R. Facer; N. E. Lumpkin; Dwight G. Rickel; L. N. Pfeiffer; K. W. West
l=0,
Applied Physics Letters | 1999
R.J. Heron; R. A. Lewis; Bridget Kane; G.R. Facer; R. G. Clark; Andrew S. Dzurak; N. E. Lumpkin; R.P. Starrett; Dwight G. Rickel; L. N. Pfeiffer; K. W. West
0.5, and 2
Journal of Materials Research | 1996
N. E. Lumpkin; Gregory R. Lumpkin; K. S. A. Butcher
\ensuremath{\mu}\mathrm{m},
Physical Review B | 2002
Jeremy L. O'Brien; A. R. Hamilton; R. G. Clark; Charles H. Mielke; J. L. Smith; J. C. Cooley; Dwight G. Rickel; R.P. Starrett; D. J. Reilly; N. E. Lumpkin; Rj Hanrahan; W. L. Hults
fabricated from structures free of the disorder associated with modulation doping. In a direct comparison in zero magnetic field we observe structure near
