Spin excitations of the spin-polarized electron gas in semimagnetic quantum wells.
Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd(1-x)Mn(x)Te quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin subbands and a spin polarization is induced in the electron gas. Above 1 T the collective modes, which disperse with the in-plane wave vector, dominate the spectra. The local spin-density approximation provides a good description of our results and enables us to confirm that the energy of the low wave vector collective mode is given by the bare Zeeman energy.
Jusserand
B
B
CNRS/LPN, Route de Nozay, 91460 Marcoussis, France.
Perez
F
F
Richards
D R
DR
Karczewski
G
G
Wojtowicz
T
T
Testelin
C
C
Wolverson
D
D
Davies
J J
JJ