Sentences with phrase «electron motion»

Because of the sheer number of electrons interacting with each other, it is not possible to solve exactly the problem of many - electron motion in solids using quantum mechanical theory.

So far, the influence of this interaction on the very fast electron motions following the absorption of light has remained unclear.

In those experiments, the resulting state was «photographed» with a longer infrared pulse, which itself had a significant influence on the ensuing electron motion.

Creating a superlattice by placing graphene on boron nitride may allow control of electron motion in graphene and make graphene electronics practical.

To observe ultrafast electron motions in space and time, one needs to measure the position of electrons in the material with a precision of the order of 0.1 nm (0.1 nm = 10 - 10 m), roughly corresponding to the distance between neighboring atoms, and on a sub-100 fs time scale (1 fs = 10 - 15s).

This time, Chang and his team have developed a new ultrafast light source for observing electron motion in molecules — made up of nuclei and electrons — at the point before the nuclei start to move.

Published by the Condensed Matter research group at the Nordic Institute for Theoretical Physics (NORDITA) at KTH Royal Institute of Technology in Sweden, the Organic Materials Database is intended as a data mining resource for research into the electric and magnetic properties of crystals, which are primarily defined by their electronic band structure — an energy spectrum of electrons motion which stem from their quantum - mechanical properties.

Electron motions induced by a strong electric field are mapped in space and time with the help of femtosecond x-ray pulses.

«With directional electron motion, strongly directed X-rays for imaging applications could be produced,» describes Prof. Eckart Rühl.

Almost by definition, collective electron motions can be described by just a handful of variables obeying simple equations, says Frank Wilczek, a Nobel - prizewinning particle physicist at the Massachusetts Institute of Technology in Cambridge.

This field focuses on phenomena such as electron motions in molecules and atoms, which can take place on attosecond timescales (an attosecond lasts for a billionth of a billionth of a second, 10 - 18 sec).

The ability to generate attosecond laser pulses effectively permits electron motions to be «photographed.»

As practiced in our group, MBE allows for exploration of correlated electron motion in materials with very low residual disorder.

The group has developed liquid - helium cooled scanning probe microscopes (SPMs) that can image electron motion through a two dimensional electron gas, in GaAs / AlGaAs and graphene / hBN layered structures.

A research team at the Max - Born - Institute has now addressed electron correlations by following ultrafast electron motions in space and time, in this way generating «maps» of the electron distribution.

In this image, patterns captured at attosecond intervals have been superimposed, thus revealing, in real time, the kind of electron motions that underlie atomic and subatomic phenomena.

In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very bright, and the photons delivered must have sufficiently high energy.

Electron motions, says Sachdev, «look more like the spread of molasses than pointlike objects traveling in a straight line.»

This pulse also has to be short to catch the direction of electron motion and have enough photon energy to knock the excited electrons out of the molecule.

The electron motions are initiated by an ultrashort optical pulse which excites an electron on an individual complex.

With two XUV pulses, we would be able to «film» the electron motion in the inner atomic shells without perturbing their dynamics,» says Dr. Boris Bergues, the leader of the new study.

Electron motion is a somewhat «abstract» object to study, due to its microscopic nature.