Kavli Affiliate: Gang Su
| First 5 Authors: Zhi-Fan Zhang, Zhen-Gang Zhu, Gang Su, ,
| Summary:
In recent years, nonlinear Hall effect has attracted great attention with
three different terms contributed by Drude effect, Berry curvature dipole and
Berry connection polarizability. In this work, we theoretically predict an
intrinsic second order spin current induced by spin-dependent Berry curvature
polarizability based on time-independent perturbation theory. We show other two
second order spin conductivities contributed by the group velocity and
spin-dependent Berry curvature dipole.A two-dimensional Rashba-Dresselhaus
spin-orbit coupled system is studied as an example, and it is found that the
intrinsic second order contribution plays a major role in the region of
$mu>0$, while current mainly comes from the extrinsic terms when $mu<0$.
Thus, the dependence of spin conductivity on chemical potential is expected to
distinguish the extrinsic and intrinsic contributions experimentally.
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