Rotational viscosity in spin resonance of hydrodynamic electrons

Abstract

In novel ultra-pure materials electrons can form a viscous fluid, which is fundamentally different by its dynamics from the electron gas in ordinary conductors with significant density of defects. The shape of the non-stationary flow of such electron fluid is similar to the alternating flow of blood in large-radius arteries [J. R. Womersley, J. Physiol. 127, 552 (1955)]. The rotational viscosity effect is responsible for interconnection between the dynamics of electron spins and flow inhomogeneities. In particular, it induces the spin polarization of electrons in a curled flow via an internal spin-orbit torque acting on electron spins. Here we show that this effect in an electron fluid placed in a magnetic field leads to a correction to the ac sample impedance, which has a resonance at the Larmor frequency of electrons. In this way, via the electrically detected spin resonance the Womersley flow of an electron fluid can be visualized and the rotational viscosity can be measured.

6 pages, 3, figures

References in corpus (9)

• Hydrodynamics of electrons in graphene
• Magnetoresistance due to edge spin accumulation
• Non-local transport and the Hall viscosity of 2D hydrodynamic electron liquids
• Geometric control of universal hydrodynamic flow in a two dimensional electron fluid
• Colossal negative magnetoresistance in a 2D electron gas
• Theory of spin hydrodynamic generation
• Stokes paradox in electronic Fermi liquids
• Valley and spin accumulation in ballistic and hydrodynamic channels
• Ballistic flow of two-dimensional electrons in a magnetic field

Cited by in corpus (1)

• Hydrodynamics of the electronic Fermi liquid: a pedagogical overview