From spin flip excitations to the spin susceptibility enhancement of a two-dimensional electron gas.
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 Cd(1-x)Mn(x)Te 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.
Institut des NanoSciences de Paris, CNRS, Universités Paris 6 and 7, 140 rue de Lourmel, 75015 Paris, France.
F
F
Perez
C
C
Aku-leh
D
D
Richards
B
B
Jusserand
L C
LC
Smith
D
D
Wolverson
G
G
Karczewski