Coulomb oscillations and Hall effect in quasi-2D graphite quantum dots.
We perform low-temperature electrical transport measurements on gated, quasi-2D graphite quantum dots. In devices with low contact resistances, we use longitudinal and Hall resistances to extract carrier densities of 9.2-13 x 10(12) cm(-2) and mobilities of 200-1900 cm(2)/V.s. In devices with high resistance contacts, we observe Coulomb blockade phenomena and infer the charging energies and capacitive couplings. These experiments demonstrate that electrons in mesoscopic graphite pieces are delocalized over nearly the whole graphite piece down to low temperatures.
Bunch
J Scott
JS
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, USA.
Yaish
Yuval
Y
Brink
Markus
M
Bolotin
Kirill
K
McEuen
Paul L
PL
D004553:Electric Conductivity; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006108:Graphite / Q000032:analysis / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure; D045663:Quantum Dots; D055672:Static Electricity
D006108:Graphite