Browsing by Subject "Atomic, molecular and chemical physics"
Now showing items 21-40 of 92
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Electronic structure of graphene beyond the linear dispersion regime
(2011)Among the many interesting features displayed by graphene, one of the most attractive is the simplicity with which its electronic structure can be described. The study of its physical properties is significantly simplified ... -
Electronic transport calculations for the conductance of Pt-1,4-phenylene diisocyanide-Pt molecular junctions.
(2010)The low-bias transport properties of a single 1,4-phenylene diisocyanide (PDI) molecule connected to two platinum (Pt) electrodes are investigated using a self-consistent ab initio approach that combines the non-equilibrium ... -
Engineering carbon chains from mechanically stretched graphene-based materials
(American Physical Society, 2011)The electrical response of graphene-based materials can be tailored under mechanical stress. We report different switching behaviors that take place in mechanically deformed graphene nanoribbons prior to the breakage of ... -
Epitaxial growth and magnetic properties of Fe nanowedge islands on Mo(110)
(2005)Fe films with a nominal thickness greater than or equal to 2 Angstrom grown on Mo(1 10) at 500 less than or equal to Tless than or equal to 750 K self-assemble into nanowedge islands supported on a pseudomorphic Fe wetting ... -
Epitaxial molybdenum oxide grown on MO (110): LEED, STM, and density functional theory calculations
(American Physical Society, 2007)The oxidation of Mo(110) was studied at 1000 ?C and 1?10?6 Torr oxygen. Low energy electron diffraction and scanning tunneling microscopy data were used to give a detailed analysis of the oxide surface structure. From ... -
Evidence for selective imaging of different magnetic ions on the atomic scale by using a scanning tunnelling microscope with a ferromagnetic probe tip.
(IOP Publishing, 1992)Atomic resolution has been obtained on a magnetite (Fe3O4(001)) surface using a scanning tunnelling microscope with nonmagnetic tungsten and ferromagnetic iron tips. Selective imaging of Fe2 + and Fe3 + on B-sites is ... -
Experimental quantitative study into the effects of electromigration field moderation on step bunching instability development on Si(111)
(2011)We experimentally studied the effects of a moderated electromigration field on the dynamics of the step bunching process on the Si(111) surface at 1130 ?C (regime II) and 1270 ?C (regime III). The surfaces with step bunch ... -
Finite-size fluctuations and photon statistics near the polariton condensation transition in a single-mode microcavity
(2006)We consider polariton condensation in a generalized Dicke model, describing a single-mode cavity containing quantum dots, and extend our previous mean-field theory to allow for finite-size fluctuations. Within ... -
Formation of the strain-induced electronic superstructure on the magnetite (111) surface
(2003)We present direct experimental evidence of the formation of a superstructure on the (111) surface of a magnetite, Fe3O4 single crystal. The superstructure, which has a periodicity of 42A and three-fold symmetry, has been ... -
Giant magnetic moment in epitaxial Fe3O4 thin films on MgO (100)
(2008)Magnetization studies on well characterized epitaxial magnetite (Fe3O4) thin films grown on MgO(100) show that the ultrathin films (<5?nm thickness) are ferromagnetic and their magnetic moments are much greater than those ... -
Improved stochastic estimation of quark propagation with Laplacian Heaviside smearing in lattice QCD
(2011)A new method of stochastically estimating the low-lying effects of quark propagation is proposed which allows accurate determinations of temporal correlations of single-hadron and multihadron operators in lattice QCD. The ... -
In-plane magnetic anisotropies in Fe3O4 films on vicinal MgO (100)
(American Physical Society, 2008)Ferromagnetic resonance was used to study the influence of vicinal (miscut) angle and film thickness on in-plane fourfold and uniaxial magnetic anisotropies in epitaxial Fe3O4 films grown on vicinal MgO(100) surfaces. The ... -
Influence of ferromagnetic substrate on the magnetoresistance of Cr film across a nonmagnetic insulating layer
(2003)(5 nm) Cr/(x?nm) MgO/Mn0.52Zn0.48Fe2O4 (MnZn spinel) substrate (1<x<7?nm), as well as (5 nm) Cr/(7 nm) MgO/glass substrate structures have been grown using molecular beam epitaxy. The influence of the MnZn spinel on the ... -
Influence of the antiphase domain distribution on the magnetic structure of magnetite thin films
(American Institute of Physics, 2006)A long-range ordered magnetic domain structure was found in magnetitelike (Fe3??O4, ? ? 0.03) thin films prepared by molecular beam epitaxy on MgO (100) substrates. The stripelike magnetic domain structure arising after ... -
Initial nucleation of Au on the (root2 x root2) R45 circle reconstructed Fe3O4 (001) surface
(2006)The initial nucleation of Au onto the (root 2 x root 2-)R45 degrees reconstructed Fe3O4(001) surface has been studied using scanning tunnelling microscopy. Au clusters are formed, with a typical lateral dimension of similar ... -
Interplay of bulk and interface effects in the electric-field-driven transition in magnetite
(2010)Contact effects in devices incorporating strongly correlated electronic materials are comparatively unexplored. We have investigated the electrically driven phase transition in magnetite 100 thin films by fourterminal methods. ... -
Inverted magnetoresistance in dual spin valve structures with a synthetic antiferromagnetic free layer
(2009)We report an oscillation of the giant magnetoresistance GMR ratio as a function of Ru layer thickness in the CoFe/Cu/ CoFe/Ru/CoFe SAF/Cu/CoFe/IrMn dual spin valve SV structure. A normal GMR with a positive sign is ... -
Investigation of the physical mechanisms of shear-force imaging
(American Institute of Physics, 1996)It is shown that shear-force imaging, as is commonly used for distance regulation in scanning near-field optical microscopy, is not a reliable technique for accurate topographic measurements. This is because different ... -
Isoscalar meson spectroscopy from lattice QCD
(2011)We extract to high statistical precision an excited spectrum of single-particle isoscalar mesons using lattice QCD, including states of high spin and, for the first time, light exotic J(PC) isoscalars. The use of a novel ... -
Kinetics of the barotropic ripple (P beta')/lamellar liquid crystal (L alpha) phase transition in fully hydrated dimyristoylphosphatidylcholine (DMPC) monitored by time-resolved x-ray diffraction.
(1991)We present here the first study of the use of a pressure-jump to induce the ripple (P,.)/lamellar liquid crystal (Lj phase transition in fully hydrated 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC). The transition ...