Talk-Polywell.org

Researchers confirmed that charge density waves are a ubiquitous phenomenon in cuprates and that they strenuously oppose superconductivity, prevailing as the temperature rises.

By applying Sachdev’s algorithm to a new round of data, Davis and his group mapped out the structure of the charge density waves, showing that the d-wave distribution of electrons was, indeed, their source.

“The paper establishes that the two patterns are the same,” Sachdev said. “It just works beautifully.”

The identity of the fundamental broken symmetry (if any) in the cuprate pseudogap state is unresolved. In fact, two apparently distinct forms of electronic symmetry breaking, one of intra-unit-cell rotational symmetry (Q=0 nematic) and the other of lattice translational symmetry (Q≠0 density wave), are reported extensively. However, indications of linkage between these two phenomena suggest the prospect of a unified fundamental description, with one intriguing possibility being an intra-unit-cell nematic density wave. Here we carry out site-specific measurements within each CuO2 unit-cell, segregating the results into three separate electronic structure images containing only the Cu sites (Cu(r)) and only the x/y-axis O sites (Ox(r) and Oy(r)). Phase resolved Fourier analysis reveals directly that the incommensurate modulations in the Ox(r) and Oy(r) sublattice images consistently exhibit a relative phase of π. We confirm this discovery on two highly distinct cuprate compounds, ruling out tunnel matrix-element and materials specific systematics. These observations demonstrate by direct sublattice phase-resolved visualization that the cuprate density wave consists essentially of spatial modulations of the intra-unit-cell nematicity; this state can equally well be described as an intra-unit-cell density wave with a d-symmetry form factor.

GIThruster wrote:Correct. Work function has to do with the electron affinity of a material.

http://en.wikipedia.org/wiki/Electron_affinity

It's especially interesting in relation to the Schottkey Barrier in capacitors with high work function electrodes such as platinum.

Abstract:
Directional emissions of light-pulses from a point-source (which is stationary at the origin of a moving inertial reference-frame) towards detectors which are all stationary at a constant radial-distance from the light-source (within the latter's inertial reference-frame) are transformed into another time-synchronized inertial reference-frame relative to which the source is moving with a speed v. Both the Galilean-transformation and the Lorentz-transformation are used. Light-pulses along different directions are compared to the equivalent situation when a spherical wavefront is emitted from the same source. The Galilean-transformation gives transformed coordinates of points on this wavefront that remain coincident on this wavefront; which, in turn, remains centered at the origin of the moving inertial reference-frame. In contrast, the Lorentz-transformation mandates that the same spherical wavefront must be observed as twin wavefronts, each of which remains centered at one of the origins of the moving and the stationary reference-frames, respectively. Here it is found that the Lorentz-transformation of simultaneous-instantaneous position-coordinates, of points on the wavefront within the moving inertial reference-frame, does not result in points which are simultaneously situated on its twin wavefront within the stationary inertial reference-frame. This is a compelling proof that an event which occurs at nonzero position-coordinates and at a nonzero time within the moving inertial reference-frame is not observed coincidently from the origin of another time-synchronized inertial reference-frame relative to which the reference-frame of the source is moving.

Abstract:
Einstein used the Lorentz-equations to transform the instantaneous position-coordinates at the moving-tail and moving-nose of a rod (within an inertial reference-frame (IRF) relative to which the rod is moving with a speed v) into the inertial reference-frame within which the rod is permanently stationary. He concluded from this transformation that such a rod contracts when it is moving past at a speed v. But, according to Galileo's principle of inertia, the natural state of a matter-entity, when it experiences no forces, is to remain stationary within its own inertial reference-frame. Motion of such an entity with mass is caused by a relativistic coordinate transformation of its position-coordinates from the inertial reference-frame within which this entity is permanently stationary into the inertial reference-frame within which the entity is observed to be moving with the speed v. When judged in terms of Galileo's concept of inertia, Einstein's transformation of moving coordinates into permanently stationary coordinates has no physics-meaning. Here, the change in length of a rod (passing at speed v) is derived by Lorentz-transforming the permanently stationary position-coordinates at the beginning and end of the rod, from the inertial reference-frame within which the rod is permanently stationary into the inertial reference-frame relative to which the rod is moving with speed v. In contrast to Einstein's derivation, an increase in the length of the moving rod is obtained: It is found that this length-increase bestows on any matter-entity a de Broglie wavelength.

In the paper, we show that there exists a close analogy between the behavior of de Broglie matter waves and that of electromagnetic waves inside a hollow waveguide, such that the guided photons can be treated as free massive particles subject to a relativistic quantum-mechanical equation. Inspired by the effective rest mass of guided photons and the zitterbewegung phenomenon of the Dirac electron, at variance with the well-known Higgs mechanism we present some different heuristic ideas on the origin of mass.

DeltaV wrote:Researchers find new phase of carbon, make diamond at room temperature
http://phys.org/news/2015-11-phase-carb ... ature.html

Giorgio wrote:I placed a copy of the research paper on a file sharing service for everyone that wants to give a look at it.
Here. It will be available for 90 days.