Cyclotron Resonance of Itinerant Holes in Ferromagnetic InMnAs/GaSb Heterostructures

TL;DR

This paper reports the first observation of hole cyclotron resonance in ferromagnetic InMnAs/GaSb heterostructures, revealing the presence of itinerant holes and their properties across different magnetic phases.

Contribution

It provides the first experimental evidence of hole CR in ferromagnetic heterostructures, confirming the existence of delocalized p-like holes consistent with Luttinger-Kohn theory.

Findings

Observation of two temperature-dependent CR resonances

Confirmation of delocalized p-like holes in the valence band

Resonances consistent with fundamental CR transitions in magnetic quantum limit

Abstract

We report the first observation of hole cyclotron resonance (CR) in ferromagnetic InMnAs/GaSb heterostructures both in the high-temperature paramagnetic phase and the low-temperature ferromagnetic phase. We clearly resolve two resonances that exhibit strong temperature dependence in position, linewidth, and intensity. We attribute the two resonances to the so-called fundamental CR transitions expected for delocalized holes in the valence band in the magnetic quantum limit, demonstrating the existence of $p$-like itinerant holes that are describable within the Luttinger-Kohn effective mass theory.