From spin flip excitations to the spin susceptibility enhancement of a two-dimensional electron gas

Florent Pérez (1) , C. Aku-Leh (2, 1) , D. Richards (2) , Bernard Jusserand (1) , L. C. Smith (3) , D. Wolverson (3) , G. Karczewski (4)

1 INSP - Institut des Nanosciences de Paris
2 Dpt of Physics [London]
3 Department of Physics [Bath]
4 Institute of Physics

The g-factor enhancement of the spin-polarized two-dimensional electron gas was measured directly over a wide range of spin polarizations, using spin flip resonant Raman scattering spectroscopy on two-dimensional electron gases embedded in Cd1-xMnxTe semimagnetic quantum wells. At zero Raman transferred momentum, the single-particle spin flip excitation, energy Z(*), coexists in the Raman spectrum with the spin flip wave of energy Z, the bare giant Zeeman splitting. We compare the measured g-factor enhancement with recent spin-susceptibility enhancement theories and deduce the spin-polarization dependence of the mass renormalization.

Domaines: Matière Condensée [cond-mat]

Florent Pérez, C. Aku-Leh, D. Richards, Bernard Jusserand, L. C. Smith, et al.. From spin flip excitations to the spin susceptibility enhancement of a two-dimensional electron gas. Physical Review Letters, 2007, 99 (2), pp.026403. ⟨10.1103/PhysRevLett.99.026403⟩. ⟨hal-01287894⟩