T. Maniv

Far- and near-field electron beam detection of hybrid cavity-plasmonic modes in gold microholes

Electromagnetic far- and near-field excitations of rectangular microholes in gold films are investigated by means of a focused

Far-field interaction of focused relativistic electron beams in electron energy loss spectroscopy of nanoscopic platelets

e

SIMPLE ANALYTICAL MODEL OF VORTEX-LATTICE MELTING IN TWO-DIMENSIONAL SUPERCONDUCTORS

beam. Radiative cavity modes, well below the surface plasmon (SP) frequency, are detected at exceptionally large distances and are shown to be strongly enhanced at near-field regions of selected slit walls due to hybridization with metal-supported SP polaritons. The proposed enhancement mechanism of such hybridized modes, found here to preserve the cutoff frequencies and symmetry characteristics of the pure waveguide modes, sheds light on the intriguing phenomenon of extraordinary optical transmission through subwavelength apertures in metallic films.

COHERENCE IN THE QUASIPARTICLE SCATTERING BY THE VORTEX LATTICE IN PURE TYPE-II SUPERCONDUCTORS

A quantum-mechanical scattering theory for relativistic, highly focused electron beams in the vacuum near nanoscopic platelets is presented, revealing an excitation mechanism due to the electron wave scattering from the platelet edges. Radiative electromagnetic excitations within the light cone are shown to arise, allowed by the breakdown of momentum conservation along the beam axis in the inelastic-scattering process. Calculated for metallic (silver and gold) and insulating (SiO{sub 2} and MgO) nanoplatelets, radiative features are revealed above the main surface-plasmon-polariton peak, and dramatic enhancements in the electron-energy-loss probability at gaps of the classical spectra are found. The corresponding radiation should be detectable in the vacuum far-field zone, with e beams exploited as sensitive tip detectors of electronically excited nanostructures.

De Haas-van Alphen oscillations in extremely type-II nearly 2D superconductors

The melting of the Abrikosov vortex lattice in a 2D type-II superconductor at high magnetic fields is studied analytically within the framework of the phenomenological Ginzburg-Landau theory. It is shown that local phase fluctuations in the superconducting order parameter, associated with low energies sliding motions of Bragg chains along the principal crystallographic axes of the vortex lattice, lead to a weak first order melting transition at a certain temperature

GOR'KOV'S EXPANSION AND THE dHvA EFFECT IN THE VORTEX STATE

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Order parameter induced phase shift in the dHvA oscillations in type-II superconductors

, well below the mean field

The analogue of the Lifshitz-Kosevich formula for the DHVA effect in the vortex state of a two-dimensional superconductor

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The transition to superconductivity in two-dimensional systems under strong magnetic fields

, where the shear modulus drops abruptly to a nonzero value. The residual shear modulus above

Vortex states in a two-dimensional superconductor at high magnetic field in a periodic pinning potential

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