Kathryn Todd
Stanford University
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Publication
Featured researches published by Kathryn Todd.
Physical Review Letters | 2007
B. Huard; Joseph A. Sulpizio; Nimrod Stander; Kathryn Todd; B. Yang; David Goldhaber-Gordon
The peculiar nature of electron scattering in graphene is among many exciting theoretical predictions for the physical properties of this material. To investigate electron scattering properties in a graphene plane, we have created a gate-tunable potential barrier within a single-layer graphene sheet. We report measurements of electrical transport across this structure as the tunable barrier potential is swept through a range of heights. When the barrier is sufficiently strong to form a bipolar junction (n-p-n or p-n-p) within the graphene sheet, the resistance across the barrier sharply increases. We compare these results to predictions for both diffusive and ballistic transport, as the barrier rises on a length scale comparable to the mean free path. Finally, we show how a magnetic field modifies transport across the barrier.
Nano Letters | 2009
Kathryn Todd; H. T. Chou; S. Amasha; David Goldhaber-Gordon
Graphene nanoribbons display an imperfectly understood transport gap. We measure transport through nanoribbon devices of several lengths. In long (>/=250 nm) nanoribbons we observe transport through multiple quantum dots in series, while shorter (</=60 nm) constrictions display behavior characteristic of single and double quantum dots. New measurements indicate that dot size may scale with constriction width. We propose a model where transport occurs through quantum dots that are nucleated by background disorder potential in the presence of a confinement gap.
Physical Review B | 2010
Patrick Gallagher; Kathryn Todd; David Goldhaber-Gordon
Physical Review B | 2013
Andrei Garcia; Markus König; David Goldhaber-Gordon; Kathryn Todd
Archive | 2010
Francois Amet; Kathryn Todd; David Goldhaber-Gordon
Bulletin of the American Physical Society | 2009
Andrei Garcia; Markus Koenig; Kathryn Todd; David Goldhaber-Gordon
Bulletin of the American Physical Society | 2009
Kathryn Todd; H. T. Chou; S. Amasha; Patrick Gallagher; David Goldhaber-Gordon
Bulletin of the American Physical Society | 2009
Markus Koenig; Andrei Garcia; Kathryn Todd; David Goldhaber-Gordon
Bulletin of the American Physical Society | 2009
Patrick G. Gallagher; Kathryn Todd; David Goldhaber-Gordon
Bulletin of the American Physical Society | 2008
Nimrod Stander; David Goldhaber-Gordon; B. Huard; Joey Sulpizio; Kathryn Todd; Bo Yang