Theory of Spin-Split Cyclotron Resonance in the Extreme Quantum Limit

Details Theory of Spin-Split Cyclotron Resonance in the Extreme Quantum Limit Theory of Spin-Split Cyclotron Resonance in the Extreme Quantum Limit

1994-01-24

arxiv.org/abs/cond-mat/9401049v1

Phys. Rev. Lett. 72, 2057 (1994)

Physics

Condensed Matter

10 pages (revtex 3.0) + 4 uuencoded postscript figures

Scientific paper

10.1103/PhysRevLett.72.2057

We present an interpretation of recent cyclotron resonance experiments on the two-dimensional electron gas in GaAs/AlGaAs heterostructures. We show that the observed dependence of the resonance spectrum on Landau level occupancy and temperature arises from the interplay of three factors: spin-splitting of the cyclotron frequency; thermal population of the two spin states; and coupling of the resonances for each spin orientation by Coulomb interactions. In addition, we derive an $f$-sum rule which allows spin polarisation to be determined directly from resonance spectra.

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