Search results for "nanoscale devices"

showing 2 items of 2 documents

Continuous-Variable Tomography of Solitary Electrons

2019

A method for characterising the wave-function of freely-propagating particles would provide a useful tool for developing quantum-information technologies with single electronic excitations. Previous continuous-variable quantum tomography techniques developed to analyse electronic excitations in the energy-time domain have been limited to energies close to the Fermi level. We show that a wide-band tomography of single-particle distributions is possible using energy-time filtering and that the Wigner representation of the mixed-state density matrix can be reconstructed for solitary electrons emitted by an on-demand single-electron source. These are highly localised distributions, isolated fro…

Density matrixSciencePhysics::Medical PhysicsComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONGeneral Physics and AstronomyFOS: Physical sciences02 engineering and technologyQuantum entanglementElectron/639/925/92701 natural sciencesGeneral Biochemistry Genetics and Molecular Biology5108 Quantum Physics510symbols.namesake5102 Atomic Molecular and Optical PhysicsElectronic and spintronic devices0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Wigner distribution function010306 general physicslcsh:Science/639/766/1130/2798/639/925/357/1017PhysicsMultidisciplinaryCondensed Matter - Mesoscale and Nanoscale PhysicsQuantum dotsFermi levelQarticleGeneral ChemistryQuantum tomography021001 nanoscience & nanotechnologyComputational physicsNanoscale devicessymbolslcsh:Q0210 nano-technology51 Physical SciencesCoherence (physics)Fermi Gamma-ray Space Telescope
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Optical Forging of Graphene into Three-Dimensional Shapes

2017

Atomically thin materials, such as graphene, are the ultimate building blocks for nanoscale devices. But although their synthesis and handling today are routine, all efforts thus far have been restricted to flat natural geometries, since the means to control their three-dimensional (3D) morphology has remained elusive. Here we show that, just as a blacksmith uses a hammer to forge a metal sheet into 3D shapes, a pulsed laser beam can forge a graphene sheet into controlled 3D shapes in the nanoscale. The forging mechanism is based on laser-induced local expansion of graphene, as confirmed by computer simulations using thin sheet elasticity theory. peerReviewed

Materials scienceBioengineeringNanotechnology02 engineering and technology01 natural sciencesForginglaw.inventionStrain engineeringForgelaw0103 physical sciencesgrafeeniGeneral Materials ScienceHammer010306 general physicsta116Nanoscopic scalenanoscale devicesta114GrapheneMechanical EngineeringgrapheneGeneral ChemistryThin sheet021001 nanoscience & nanotechnologyCondensed Matter Physics3d shapesEngineering physicsoptical forging0210 nano-technologyNano Letters
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