Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet.
We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling nu=1. The energy of this mode can serve as a probe of the many-body exchange interaction on short length scales. Its magnetic field dependence is compared with predictions based on Hartree-Fock theory. They agree well when including the nonzero width of the electron system. From the measured energies, the exchange enhanced g factor is extracted. It diverges at small fields and differs largely from g factors obtained via transport activation studies.
Van'kov
A B
AB
Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia.
Kulik
L V
LV
Kukushkin
I V
IV
Kirpichev
V E
VE
Dickmann
S
S
Zhilin
V M
VM
Smet
J H
JH
von Klitzing
K
K
Wegscheider
W
W