2,545 research outputs found
Quantum control of electron--phonon scatterings in artificial atoms
The phonon-induced dephasing dynamics in optically excited semiconductor
quantum dots is studied within the frameworks of the independent Boson model
and optimal control. We show that appropriate tailoring of laser pulses allows
a complete control of the optical excitation despite the phonon dephasing, a
finding in marked contrast to other environment couplings.Comment: to appear in Phys. Rev. Let
Coherent rotations of a single spin-based qubit in a single quantum dot at fixed Zeeman energy
Coherent rotations of single spin-based qubits may be accomplished
electrically at fixed Zeeman energy with a qubit defined solely within a single
electrostatically-defined quantum dot; the -factor and the external magnetic
field are kept constant. All that is required to be varied are the voltages on
metallic gates which effectively change the shape of the elliptic quantum dot.
The pseudospin-1/2 qubit is constructed from the two-dimensional ,
subspace of three interacting electrons in a two-dimensional
potential well. Rotations are created by altering the direction of the
pseudomagnetic field through changes in the shape of the confinement potential.
By deriving an exact analytic solution to the long-range Coulomb interaction
matrix elements, we calculate explicitly the range of magnitudes and directions
the pseudomagnetic field can take. Numerical estimates are given for {GaAs}.Comment: Restructured manuscript, more details shown (results unchanged); Six
pages, revtex4; More info at http://soliton.phys.dal.c
Radius dependent shift of surface plasmon frequency in large metallic nanospheres: theory and experiment
Theoretical description of oscillations of electron liquid in large metallic
nanospheres (with radius of few tens nm) is formulated within
random-phase-approximation semiclassical scheme. Spectrum of plasmons is
determined including both surface and volume type excitations. It is
demonstrated that only surface plasmons of dipole type can be excited by
homogeneous dynamical electric field. The Lorentz friction due to irradiation
of electro-magnetic wave by plasmon oscillations is analyzed with respect to
the sphere dimension. The resulting shift of resonance frequency turns out to
be strongly sensitive to the sphere radius. The form of e-m response of the
system of metallic nanospheres embedded in the dielectric medium is found. The
theoretical predictions are verified by a measurement of extinction of light
due to plasmon excitations in nanosphere colloidal water solutions, for Au and
Ag metallic components with radius from 10 to 75 nm. Theoretical predictions
and experiments clearly agree in the positions of surface plasmon resonances
and in an emergence of the first volume plasmon resonance in the e-m response
of the system for limiting big nanosphere radii, when dipole approximation is
not exact
- …