Speaker
Description
We present a detailed analysis of the interband mixing effects on spin currents. Specifically, we calculate the intrinsic spin current in a nonmagnetic noncentrosymmetric crystal in the presence of electron-lattice spin-orbit coupling. We show that the standard definition of the spin current operator in terms of an effective band Hamiltonian cannot be justified using a microscopic theory. Ignoring contributions arising from integrating out remote bands can lead to qualitatively wrong results. The modified expression for the spin current operator contains additional terms, which dominate the equilibrium spin current in a uniform crystal. We show that the magnitude of these additional terms can considerably exceed the spin current obtained using the standard definition.
| Keyword-1 | spin current |
|---|---|
| Keyword-2 | spin-orbit coupling |
| Keyword-3 | multiband effects |