Lloyd-Hughes, JFailla, MYe, JiandongJones, S P PTeo, Kie LeongJagadish, Chennupati2015-12-100003-6951http://hdl.handle.net/1885/70077The cyclotron resonance of polarons in Zn<inf>1-</inf><inf>x</inf>Mg<inf>x</inf>O/ZnO heterostructures (with 0.15 < x < 0.22) was studied by terahertz time-domain spectroscopy. Low-temperature magnetoconductivity spectra of the 2D electron gas at the Zn<inf>1-</inf><inf>x</inf>Mg<inf>x</inf>O/ZnO interface determined the polaron density, mass, and scattering rate. The cyclotron mass of 2D polarons was found to increase significantly with magnetic field B from 0.24 m<inf>e</inf> at B = 2 T to 0.37 m<inf>e</inf> at B = 7.5 T. A nonlinear cyclotron frequency with B was also observed for 3D polarons in ZnO. The findings are discussed in the context of polaron mass renormalization driven by the electron-LO-phonon and electron-acoustic phonon interactions.Author/s retain copyright201510.1063/1.49214692015-12-10