3,077 research outputs found
Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot
Spin relaxation from a triplet excited state to a singlet ground state in a
semiconductor quantum dot is studied by employing an electrical pump-and-probe
method. Spin relaxation occurs via cotunneling when the tunneling rate is
relatively large, confirmed by a characteristic square dependence of the
relaxation rate on the tunneling rate. When cotunneling is suppressed by
reducing the tunneling rate, the intrinsic spin relaxation is dominated by
spin-orbit interaction. We discuss a selection rule of the spin-orbit
interaction based on the observed double-exponential decay of the triplet
state.Comment: 4 pages, 4 figure
Modal interpolation program, L215 (INTERP). Volume 1: Engineering and usage
The usage of the Modal Interpolation Program L215 (INTERP) is described. The program uses modal data to form sets of arrays containing interpolation coefficients. The interpolation arrays can then be used to determine displacements at various aerodynamic surface and surface slopes that are parallel and perpendicular to the freestream direction. Five different interpolation methods are available. A description of the data manipulation and the interpolation methods is presented
Valley Polarization in Si(100) at Zero Magnetic Field
The valley splitting, which lifts the degeneracy of the lowest two valley
states in a SiO/(100)Si/SiO quantum well is examined through transport
measurements. We demonstrate that the valley splitting can be observed directly
as a step in the conductance defining a boundary between valley-unpolarized and
polarized regions. This persists to well above liquid helium temperature and
shows no dependence on magnetic field, indicating that single-particle valley
splitting and valley-polarization exist in (100) silicon even at zero magnetic
field.Comment: Accpeted for publication in Phys. Rev. Let
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