Even-order high-harmonic emission in non-centrosymmetric 2D materials is shown to require a broken twofold rotational symmetry of the spin texture, plus nonzero Berry curvature when time-reversal symmetry is preserved.
Rashba, Properties of semiconductors with an ex- tremum loop
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Hallmarks of spin textures for high-harmonic generation in two-dimensional materials
Even-order high-harmonic emission in non-centrosymmetric 2D materials is shown to require a broken twofold rotational symmetry of the spin texture, plus nonzero Berry curvature when time-reversal symmetry is preserved.