Far-infraredmagneto-absorptionofdouble-layertwo-dimensional electronsystemintiltedmagneticelds

Far-infrared magneto-absorption of double-layer two-dimensional electron system has been measured by Fourier transform spectrometer in tilted magnetic elds. We have measured the dependence of cyclotron mass (mC) on the parallel (Bk) and perpendicular (B?) magnetic elds systematically. The obtained Bk dependence of mC is complicated and varies with B?, which cannot be explained by semi-classical theory. ? 2000 Elsevier Science B.V. All rights reserved.