Abstract
In two-dimensional electron systems (2DES), a hydrodynamic regime with remarkable viscous effects is recognized when the sample width is small enough and momentum-conserving scattering is dominant. Based on hydrodynamic calculations for a 2DES, we obtain large effective viscosity coefficients, which lead to large negative magnetoresistance (MR) and Hall resistance due to the effect of an in-plane Stern-Gerlach force on the viscosity components. The spin-dependent viscous effect manifests itself via both longitudinal and Hall resistances. The negative MR and Hall resistance are markedly sensitive to the perpendicular magnetic field with amplitude around zero, which would be useful in MR sensors and magnetic recording devices.
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