Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Acoustic spin Hall effect in strong spin-orbit metals   We report on the observation of the acoustic spin Hall effect that
facilitates lattice motion induced spin current via spin orbit interaction
(SOI). Under excitation of surface acoustic wave (SAW), we find a spin current
flows orthogonal to the propagation direction of a surface acoustic wave (SAW)
in non-magnetic metals. The acoustic spin Hall effect manifests itself in a
field-dependent acoustic voltage in non-magnetic metal (NM)/ferromagnetic metal
(FM) bilayers. The acoustic voltage takes a maximum when the NM layer thickness
is close to its spin diffusion length, vanishes for NM layers with weak SOI and
increases linearly with the SAW frequency. To account for these results, we
find the spin current must scale with the SOI and the time derivative of the
lattice displacement. Such form of spin current can be derived from a Berry
electric field associated with time varying Berry curvature and/or an
unconventional spin-lattice interaction mediated by SOI. These results, which
imply the strong coupling of electron spins with rotating lattices via the SOI,
show the potential of lattice dynamics to supply spin current in strong spin
orbit metals.

13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph