Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-06-06
Solid State Communications, Vol 127, 109 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Submitted to special issue of Solid State Comm
Scientific paper
10.1016/S0038-1098(03)00339-9
Resonant inelastic light scattering experiments access the low lying excitations of electron liquids in the fractional quantum Hall regime in the range $2/5 \geq \nu \geq 1/3$. Modes associated with changes in the charge and spin degrees of freedom are measured. Spectra of spin reversed excitations at filling factor $\nu \gtrsim 1/3$ and at $\nu \lesssim 2/5$ identify a structure of lowest spin-split Landau levels of composite fermions that is similar to that of electrons. Observations of spin wave excitations enable determinations of energies required to reverse spin. The spin reversal energies obtained from the spectra illustrate the significant residual interactions of composite fermions. At $\nu = 1/3$ energies of spin reversal modes are larger but relatively close to spin conserving excitations that are linked to activated transport. Predictions of composite fermion theory are in good quantitative agreement with experimental results.
Dennis Brian S.
Dujovne Irene
Hirjibehedin Cyrus F.
Kang Moonsoo
Pfeiffer Loren N.
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