Ultrahigh-Field Hole Cyclotron Resonance Absorption in InMnAs Films

Details Ultrahigh-Field Hole Cyclotron Resonance Absorption in InMnAs Films Ultrahigh-Field Hole Cyclotron Resonance Absorption in InMnAs Films

2004-04-27

arxiv.org/abs/cond-mat/0404635v1

Phys. Rev. B 70, 195211 (2004)

Physics

Condensed Matter

Materials Science

8 pages, 10 Postscript figures

Scientific paper

10.1103/PhysRevB.70.195211

We have carried out an ultrahigh-field cyclotron resonance study of p-type In1-xMnxAs films, with Mn composition x ranging from 0% to 2.5%, grown on GaAs by low-temperature molecular-beam epitaxy. Pulsed magnetic fields up to 500 T were used to make cyclotron resonance observable in these low-mobility samples. The clear observation of hole cyclotron resonance is direct evidence of the existence of a large number of itinerant, effective-mass-type holes rather than localized d-like holes. It further suggests that the p-d exchange mechanism is more favorable than the double exchange mechanism in this narrow gap InAs-based dilute magnetic semiconductor. In addition to the fundamental heavy-hole and light-hole cyclotron resonance absorption appearing near the high-magnetic-field quantum limit, we observed many inter-Landau-level absorption bands whose transition probabilities are stronglydependent on the sense of circular polarization of the incident light.

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