Angle-dependent cyclotron resonance in organic Q2D conductors

We show a mechanism for angle-dependent resonant oscillations of high-frequency conductivity and surface impedance in organic Q2D conductors in the presence of strong magnetic field H0. In highly anisotropic conducting systems, the drift velocity vD of electrons is an oscillatory function of the angle of the magnetic field direction. As a result the location of Landau absorption regions depends on the orientation of H0. Under the condition of anomalous skin effect, when the displacement of an electron over the period of electron motion in a magnetic field exceeds skin depth, the Landau damping becomes essential. In this case the angle-dependent oscillations of high-frequency conductivity and surface impedance result from the angular dependence of drift velocity should appear. For the directions of H0, such that vD is close to zero, the intensity of cyclotron resonance is of the same order as the intensity of the resonance in a magnetic field parallel to the sample surface.