1,950 research outputs found
Interface states in junctions of two semiconductors with intersecting dispersion curves
A novel type of shallow interface state in junctions of two semiconductors
without band inversion is identified within the envelope function
approximation, using the two-band model. It occurs in abrupt junctions when the
interband velocity matrix elements of the two semiconductors differ and the
bulk dispersion curves intersect. The in-plane dispersion of the interface
state is found to be confined to a finite range of momenta centered around the
point of intersection. These states turn out to exist also in graded junctions,
with essentially the same properties as in the abrupt case.Comment: 1 figur
The local phase transitions of the solvent in the neighborhood of a solvophobic polymer at high pressures
We investigate local phase transitions of the solvent in the neighborhood of
a solvophobic polymer chain which is induced by a change of the polymer-solvent
repulsion and the solvent pressure in the bulk solution. We describe the
polymer in solution by the Edwards model, where the conditional partition
function of the polymer chain at a fixed radius of gyration is described by a
mean-field theory. The contributions of the polymer-solvent and the
solvent-solvent interactions to the total free energy are described within the
mean-field approximation. We obtain the total free energy of the solution as a
function of the radius of gyration and the average solvent number density
within the gyration volume. The resulting system of coupled equations is solved
varying the polymer-solvent repulsion strength at high solvent pressure in the
bulk. We show that the coil-globule (globule-coil) transition occurs
accompanied by a local solvent evaporation (condensation) within the gyration
volum
Bound state properties of four-body muonic quasi-atoms
Total energies and various bound state properties are determined for the
ground states in all six four-body muonic
quasi-atoms. These quasi-atoms contain two nuclei of the hydrogen isotopes
, one negatively charged muon and one electron
. In general, each of the four-body muonic
quasi-atoms, where , can be considered as the regular
one-electron (hydrogen) atom with the complex nucleus
which has a finite number of bound states. Furthermore, all properties of such
quasi-nuclei are determined from highly accurate
computations performed for the three-body muonic ions
with the use of pure Coulomb interaction potentials between particles. It is
shown that the bound state spectra of such quasi-atoms are similar to the
spectrum of the regular hydrogen atoms, but there are a few important
differences. Such differences can be used in future experiments to improve the
overall accuracy of current evaluations of various properties of hydrogen-like
systems, including the lowest-order relativistic and QED corrections
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