Browsing Physics (Scholarly Publications) by Author "FERREIRA, MAURO"
Now showing items 21-32 of 32
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Non-collinear coupling between magnetic adatoms in carbon nanotubes
FERREIRA, MAURO (2007)The long-range character of the exchange coupling between localized magnetic moments indirectly mediated by the conduction electrons of metallic hosts often plays a significant role in determining the magnetic order ... -
Origami-based spintronics in graphene
FERREIRA, MAURO (2013)We show that periodically folded graphene sheets with enhanced spin-orbit interaction due to curvature effects can carry spin-polarized currents and have gaps in the electronic spectrum in the presence of weak magnetic ... -
Physical Mechanism for the mechanical reinforcement in nanotube-polymer composite materials
COLEMAN, JONATHAN; FERREIRA, MAURO (2005)The significant increase in the Young?s modulus of nanotube-polymer composites is often correlated with the formation of a crystalline layer of polymers surrounding the nanotubes. Although the improved stress transfer ... -
Quantum ratchets with few bands below the barrier
FERREIRA, MAURO (American Physical Society, 2002)We investigate directed motion in nonadiabatically rocked ratchet systems sustaining few bands below the barrier. Upon restricting the dynamics to the lowest M bands, the total system-plus-bath Hamiltonian is mapped onto ... -
Radial oscillations of local density of states in carbon nanotubes
FERREIRA, MAURO (2001)By performing an analytical study of the electronic structure of metallic carbon nanotubes, we show that the local density of states exhibits well-defined oscillations as a function of the nanotube radius. The periods ... -
The relationship between network morphology and conductivity in nanotube films
COLEMAN, JONATHAN; FERREIRA, MAURO (2008)We have characterized both the direct current conductivity and morphology of a wide range of films made from bundled nanotubes, produced by a selection of commercial suppliers. The conductivity increases with increasing ... -
Sensitive Electromechanical Sensors Using Viscoelastic Graphene-Polymer Nanocomposites
FERREIRA, MAURO; BOLAND, CONOR; COLEMAN, JONATHAN (2016) -
Sublattice asymmetry of impurity doping in graphene: A review.
FERREIRA, MAURO (2014)In this review we highlight recent theoretical and experimental work on sublattice asymmetric doping of impurities in graphene, with a focus on substitutional nitrogen dopants. It is well known that one current limitation ... -
Sudden decay of indirect exchange coupling between magnetic atoms on carbon nanotubes
FERREIRA, MAURO (2008)Indirect exchange coupling plays a central role in determining the magnetic order in systems composed of adsorbed magnetic moments on a metallic host. For low-dimensional metallic structures, such as nanotubes, this ... -
Theory of the exchange coupling in magnetic metallic multilayers
FERREIRA, MAURO (American Physical Society, 1994)Existing theories of the oscillatory exchange coupling in magnetic metallic multilayers are reconciled within a common approach. It is shown that Ruderman-Kittel-Kasuya-Yosida?type theories and full-confinement quantum-well ... -
Transport suppression in polymer-doped zigzag carbon nanotubes
FERREIRA, MAURO (2005)The conductance of zigzag carbon nanotubes in the presence of grafted polymers attached to their walls is investigated. A theoretical study of the dependence of the transport on the nature of the molecule and on the ... -
Upper bound for the conductivity of nanotube networks
COLEMAN, JONATHAN; FERREIRA, MAURO (2009)Films composed of nanotube networks have their conductivities regulated by the junction resistances formed between tubes. Conductivity values are enhanced by lower junction resistances but should reach a maximum that is ...