Measurements and simulations of wakefields at the Accelerator Test Facility 2
Not Available
Snuverink, J.↗
Engineering topics
Kuroda, S.
Publications and source records attributed to Kuroda, S..
Spin dynamics of an individual Cr atom in a semiconductor quantum dot under optical excitation
We studied the spin dynamics of a Cr atom incorporated in a II-VI semiconductor quantum dot using photon correlation techniques. We used recently developed singly Cr-doped CdTe/ZnTe quantum dots to access the spin of an individual magnetic atom. Auto-correlation of the photons emitted by the quantum dot under continuous wave optical excitation reveals fluctuations of the localized spin with a timescale in the 10 ns range. Cross-correlation gives quantitative transfer time between Cr spin states. A calculation of the time dependence of the spin levels population in Cr-doped quantum dots shows that the observed spin dynamics is dominated by the exciton-Cr interaction. These measurements also provide a lower bound in the 20 ns range for the intrinsic Cr spin relaxation time.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Structural analysis of Cr aggregation in ferromagnetic semiconductor (Zn,Cr)Te
The Cr aggregation in a ferromagnetic semiconductor (Zn,Cr)Te was studied by performing precise analyses using TEM and XRD of microscopic structure of the Cr-aggregated regions formed in iodine-doped Zn{sub 1−x}Cr{sub x}Te films with a relatively high Cr composition x ∼ 0.2. It was found that the Cr-aggregated regions are composed of Cr{sub 1−δ}Te nanocrystals of the hexagonal structure and these hexagonal precipitates are stacked preferentially on the (111)A plane of the zinc-blende (ZB) structure of the host ZnTe crystal with its c-axis nearly parallel to the (111){sub ZB} plane.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
ATF2 Commissioning
ATF2 is a final-focus test beam line that attempts to focus the low-emittance beam from the ATF damping ring to a beam size of about 37 nm, and at the same time to demonstrate nm beam stability, using numerous advanced beam diagnostics and feedback tools. The construction is well advanced and beam commissioning of ATF2 has started in the second half of 2008. ATF2 is constructed and commissioned by ATF international collaborations with strong US, Asian and European participation.
Seryi, Andrei↗