8,512 research outputs found
Quantum states in a magnetic anti-dot
We study a new system in which electrons in two dimensions are confined by a
non homogeneous magnetic field. The system consists of a heterostructure with
on top of it a superconducting disk. We show that in this system electrons can
be confined into a dot region. This magnetic anti-dot has the interesting
property that the filling of the dot is a discrete function of the magnetic
field. The circulating electron current inside and outside the anti-dot can be
in opposite direction for certain bound states. And those states exhibit a
diamagnetic to paramagnetic transition with increasing magnetic field. The
absorption spectrum consists of many peaks, some of which violate Kohn's
theorem, and which is due to the coupling of the center of mass motion with the
other degrees of freedom.Comment: 6 pages, 12 ps figure
Optical properties of (In,Ga)As capped InAs quantum dots grown on [11k] substrates
Using three-dimensional k.p calculation including strain and
piezoelectricity, we showed that the size of the quantum dot (QD) in the growth
direction determines the influence of the (In,Ga)As capping layer on the
optical properties of [11k] grown InAs QDs, where k=1,2,3. For flat dots,
increase of In concentration in the capping layer leads to a decrease of the
transition energy, as is the case of [001] grown QDs, whereas for large dots an
increase of the In concentration in the capping layer is followed by an
increase of the transition energy up to a critical concentration of In, after
which the optical transition energy starts to decrease
Quantum dot size dependent influence of the substrate orientation on the electronic and optical properties of InAs/GaAs quantum dots
Using 3D k.p calculation including strain and piezoelectricity we predict
variation of electronic and optical properties of InAs/GaAs quantum dots (QDs)
with the substrate orientation. The QD transition energies are obtained for
high index substrates [11k], where k = 1,2,3 and are compared with [001]. We
find that the QD size in the growth direction determines the degree of
influence of the substrate orientation: the flatter the dots, the larger the
difference from the reference [001] case.Comment: Submitted to Appl. Phys. Let
Klein paradox for a pn junction in multilayer graphene
Charge carriers in single and multilayered graphene systems behave as chiral
particles due to the particular lattice symmetry of the crystal. We show that
the interplay between the meta-material properties of graphene multilayers and
the pseudospinorial properties of the charge carriers result in the occurrence
of Klein and anti-Klein tunneling for rhombohedral stacked multilayers. We
derive an algebraic formula predicting the angles at which these phenomena
occur and support this with numerical calculations for systems up to four
layers. We present a decomposition of an arbitrarily stacked multilayer into
pseudospin doublets that have the same properties as rhombohedral systems with
a lower number of layers.Comment: 5 pages, 4 figure
Ballistic spin transport through electronic stub tuners: spin precession, selection, and square-wave transmission
Ballistic spin transport is studied through electronic tuners with double
stubs attached to them. The spins precess due to the spin-orbit interaction.
Injected polarized spins can exit the structure polarized in the opposite
direction. A nearly square-wave spin transmission, with values 1 and 0, can be
obtained using a periodic system of symmetric stubs and changing their length
or width. The gaps in the transmission can be widened using asymmetric stubs.
An additional modulation is obtained upon combining stub structures with
different values of the spin-orbit strength.Comment: 3 pages, 4 figure
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