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Spin Hall drag in electronic bilayers
1Department of Physics, University of Regensburg, 93040 Regensburg, Germany.
Physical Review Letters
|April 7, 2010
Summary
We predict a new spin Hall drag effect in electronic bilayers, where current in one layer generates spin accumulation in another. This arises from spin-orbit and Coulomb interactions, with observable effects in optical experiments.
Area of Science:
- Condensed matter physics
- Spintronics
- Quantum mechanics
Background:
- Electronic bilayers exhibit complex interactions.
- Spin-orbit and Coulomb interactions are fundamental in condensed matter systems.
- Spin transport phenomena are crucial for next-generation electronics.
Purpose of the Study:
- To theoretically predict and analyze a novel phenomenon: spin Hall drag in electronic bilayers.
- To elucidate the underlying physical mechanisms driving spin Hall drag.
- To identify experimental methods for observing this predicted effect.
Main Methods:
- Theoretical analysis using the Boltzmann equation formalism.
- Modeling of coupled spin-orbit and Coulomb interactions in bilayer systems.
- Temperature-dependent analysis of resistivity contributions.
Main Results:
- Prediction of the spin Hall drag effect: spin accumulation generated across one layer by current in another.
- Identification of two key contributions to spin Hall drag resistivity: side-jump (T2 dependence) and skew-scattering (T3 dependence).
- Theoretical prediction of observable spin accumulation via optical rotation experiments.
Conclusions:
- Spin Hall drag is a novel effect in electronic bilayers driven by combined spin-orbit and Coulomb interactions.
- The temperature dependence of resistivity provides distinct signatures for different contributions.
- Optical rotation experiments offer a viable pathway for experimental verification of spin Hall drag.
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