456 research outputs found
Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect
Nuclear spins are polarized electrically in a breakdown regime of an
odd-integer quantum Hall effect (QHE). Electron excitation to the upper Landau
subband with the opposite spin polarity flips nuclear spins through the
hyperfine interaction. The polarized nuclear spins reduce the spin-splitting
energy and accelerate the QHE breakdown. The Knight shift of the nuclear spins
is also measured by tuning electron density during the irradiation of
radio-frequency magnetic fields.Comment: 3 pages, 2 figures, EP2DS-1
Far-infrared rays control prostate cancer cells _in vitro_ and _in vivo_
We introduce a new effective method to control hormone refractory prostate cancer cells by using an activated rubber/resin form (RB), far-infrared ray emitter, with or without sodium butyrate (SB). The growth of three human prostate cancer cell lines (Du145, PC-3 and LNCaP) was suppressed _in vitro_ and _in vivo_ by using RB, and the cells were eradicated with RB + 3 mM SB. G1 arrest and apoptotic pathway proteins were induced by RB with intensified expressions of apoptosis - related mRNA on cDNA microarray. RB radiates the infra-red rays of the 4 to 25 [mu]m wavelengths to an object which exert a favorable influence on a cancer control. These results may render us a new therapeutic modality in hormone refractory prostate cancer
Coherent manipulation of nuclear spins in the breakdown regime of integer quantum Hall states
We demonstrate a new method for electrical manipulation of nuclear spins
utilizing dynamic nuclear polarization induced by quantum Hall effect
breakdown. Nuclear spins are polarized and detected through the hyperfine
interaction between a nuclear spin system and a two-dimensional electron system
located at an interface of GaAs/AlGaAs single heterostructure. Coherent
oscillations between the nuclear-spin quantum states are observed by measuring
the longitudinal voltage of the conductor.Comment: 4 pages, 2 figure
- …