31,551 research outputs found
Electron transport in semiconducting carbon nanotubes with hetero-metallic contacts
We present an atomistic self-consistent study of the electronic and transport
properties of semiconducting carbon nanotube in contact with metal electrodes
of different work functions, which shows simultaneous electron and hole doping
inside the nanotube junction through contact-induced charge transfer. We find
that the band lineup in the nanotube bulk region is determined by the effective
work function difference between the nanotube channel and source/drain
electrodes, while electron transmission through the SWNT junction is affected
by the local band structure modulation at the two metal-nanotube interfaces,
leading to an effective decoupling of interface and bulk effects in electron
transport through nanotube junction devices.Comment: Higher quality figures available at http://www.albany.edu/~yx15212
Neutrino masses and mixings
We propose a novel theoretical understanding of neutrino masses and mixings,
which is attributed to the intrinsic vector-like feature of the regularized
Standard Model at short distances. We try to explain the smallness of Dirac
neutrino masses and the decoupling of the right-handed neutrino as a free
particle. Neutrino masses and mixing angles are completely related to each
other in the Schwinger-Dyson equations for their self-energy functions. The
solutions to these equations and a possible pattern of masses and mixings are
discussed.Comment: LaTex 11 page
Two coupled Jaynes-Cummings cells
We develop a theoretical framework to evaluate the energy spectrum,
stationary states, and dielectric susceptibility of two Jaynes-Cummings systems
coupled together by the overlap of their respective longitudinal field modes,
and we solve and characterize the combined system for the case that the two
atoms and two cavities share a single quantum of energy.Comment: 7 pages, 4 figure
Nearest-neighbor coupling asymmetry in the generation of cluster states
We demonstrate that charge-qubit cluster state generation by capacitive
coupling is anisotropic. Specifically, horizontal vs vertical nearest-neighbor
inter-qubit coupling differs in a rectangular lattice. We show how to
ameliorate this anisotropy by applying potential biases to the array of double
dots.Comment: 7 pages, 2 figure
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