312 research outputs found
Colossal Spin Hall Effect in Ultrathin Metallic Films
We predict spin Hall angles up to 80% for ultrathin noble metal films with
substitutional Bi impurities. The colossal spin Hall effect is caused by
enhancement of the spin Hall conductivity in reduced sample dimension and a
strong reduction of the charge conductivity by resonant impurity scattering.
These findings can be exploited to create materials with high efficiency of
charge to spin current conversion by strain engineering.Comment: 4 pages, 5 figure
Discrete nonholonomic LL systems on Lie groups
This paper applies the recently developed theory of discrete nonholonomic mechanics to the
study of discrete nonholonomic left-invariant dynamics on Lie groups. The theory is illustrated
with the discrete versions of two classical nonholonomic systems, the Suslov top and the Chaplygin
sleigh. The preservation of the reduced energy by the discrete flow is observed and the
discrete momentum conservation is discussed
Evaluation of conduction eigenchannels of an adatom probed by an STM tip
Ballistic conductance through a single atom adsorbed on a metallic surface
and probed by a scanning tunneling microscope (STM) tip can be decomposed into
eigenchannel contributions, which can be potentially obtained from shot noise
measurements. Our density functional theory calculations provide evidence that
transmission probabilities of these eigenchannels encode information on the
modifications of the adatom's local density of states caused by its interaction
with the STM tip. In the case of open shell atoms, this can be revealed in
nonmonotonic behavior of the eigenchannel's transmissions as a function of the
tip-adatom separation.Comment: 4.5 pages, 5 figures, REVTe
Comparison of CuBr-laser frequency operation modes
The results of a comparative study of CuBr-laser energy characteristics with a small active volume operating in pulse-periodic mode and dual pump pulses are presented. The advantages of these regimes in the range 5-100 Hz and 5-100 kHz for output power, the energy generation and efficiency of the laser are shown
Seebeck Effect in Nanoscale Ferromagnets
We present a theory of the Seebeck effect in nanoscale ferromagnets with
dimensions smaller than the spin diffusion length. The spin accumulation
generated by a temperature gradient strongly affects the thermopower. We also
identify a correction arising from the transverse temperature gradient induced
by the anomalous Ettingshausen effect. The effect of an induced spin-heat accu-
mulation gradient is considered as well. The importance of these effects for
nanoscale ferromagnets is illustrated by ab initio calculations for dilute
ferromagnetic alloys.Comment: 5 pages, 2 figure
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