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- W3035984503 abstract "Spin Hall effect (SHE) is the generation of spin current due to an electric field, and has been observed in a variety of materials. We investigate the perspective of detecting spin Hall current in heavy-ion collisions. While the electric field created in heavy-ion collisions has a very short lifetime, the (minus) chemical potential gradient can be viewed as an analogous electric field. Noting the longitudinal gradient of baryon chemical potential at RHIC beam energy scan (BES) energies is sizable, we predict that such ``analogous baryonic electric field'' will lead to spin Hall current carried by $Lambda$ ($bar{Lambda}$) hyperon. In addition, spin Hall current can be induced by temperature gradient, the phenomenon of which is referred to as ``thermally-induced spin Hall effect'' or spin Nernst effect (SNE). We propose to measure the first Fourier coefficients of local spin polarization of $Lambda$ ($bar{Lambda}$) with respect to azimuthal angle to probe spin Hall current, and name those observables as ``directed spin flow''. By employing a thermal field theory calculation and a phenomenologically motivated freeze-out prescription for textit{central collisions} at a representative BES energy ($sqrt{s}=19.6$ GeV), we find the magnitude of the induced ``directed spin flow'' is of the order $10^{-3}$. Furthermore, we demonstrate how to use (baryon) charge-dependent and charge-independent ``directed spin flow'' to discriminate spin Hall current induced by chemical potential and temperature gradient respectively." @default.
- W3035984503 created "2020-06-25" @default.
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- W3035984503 date "2020-06-22" @default.
- W3035984503 modified "2023-09-27" @default.
- W3035984503 title "Baryonic spin Hall effect in heavy ion collisions" @default.
- W3035984503 hasPublicationYear "2020" @default.
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