Giant Collective Spin-Orbit Field in a Quantum Well: Fine Structure of Spin Plasmons

Abstract

We employ inelastic light scattering with magnetic fields to study intersubband spin plasmons in a quantum well. We demonstrate the existence of a giant collective spin-orbit (SO) field that splits the spin-plasmon spectrum into a triplet. The effect is remarkable as each individual electron would be expected to precess in its own momentum-dependent SO field, leading to D'yakonov-Perel' dephasing. Instead, many-body effects lead to a striking organization of the SO fields at the collective level. The macroscopic spin moment is quantized by a uniform collective SO field, five times higher than the individual SO field. We provide a momentum-space cartography of this field.

5 pages, 4 figures. Supplemental material available here as an ancillary file

References in corpus (4)

• Emergence of the persistent spin helix in semiconductor quantum wells
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
• Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4 Puzzle
• Plasmon mass and Drude weight in strongly spin-orbit-coupled 2D electron gases

Cited by in corpus (7)

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• Electron Spin Resonance in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling
• Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
• Spin-orbit interaction enabled electronic Raman scattering from charge collective modes
• Spin waves in doped graphene: a time-dependent spin-density-functional approach to collective excitations in paramagnetic two-dimensional Dirac fermion gases
• Spin precession and spin waves in a chiral electron gas: beyond Larmor's theorem