8,534 research outputs found
Determination of anisotropic dipole moments in self-assembled quantum dots using Rabi oscillations
By investigating the polarization-dependent Rabi oscillations using
photoluminescence spectroscopy, we determined the respective transition dipole
moments of the two excited excitonic states |Ex> and |Ey> of a single
self-assembled quantum dot that are nondegenerate due to shape anisotropy. We
find that the ratio of the two dipole moments is close to the physical
elongation ratio of the quantum dot.Comment: 11 pages, 2 figures, MS Word generated PDF fil
Decoherence processes during active manipulation of excitonic qubits in semiconductor quantum dots
Using photoluminescence spectroscopy, we have investigated the nature of Rabi
oscillation damping during active manipulation of excitonic qubits in
self-assembled quantum dots. Rabi oscillations were recorded by varying the
pulse amplitude for fixed pulse durations between 4 ps and 10 ps. Up to 5
periods are visible, making it possible to quantify the excitation dependent
damping. We find that this damping is more pronounced for shorter pulse widths
and show that its origin is the non-resonant excitation of carriers in the
wetting layer, most likely involving bound-to-continuum and continuum-to-bound
transitions.Comment: 18 pages, 4 figure
New Terms for the Compact Form of Electroweak Chiral Lagrangian
The compact form of the electroweak chiral Lagrangian is a reformulation of
its original form and is expressed in terms of chiral rotated electroweak gauge
fields, which is crucial for relating the information of underlying theories to
the coefficients of the low-energy effective Lagrangian. However the compact
form obtained in previous works is not complete. In this letter we add several
new chiral invariant terms to it and discuss the contributions of these terms
to the original electroweak chiral Lagrangian.Comment: 3 pages, references adde
- …