Cyclotron resonance from photoexcited electrons in ZnTe

Electron cyclotron resonance has been observed in ZnTe single crystals ($p$-type semiconductor) at 9.2 and 35 GHz using electron-paramagnetic-resonance equipment. The electrons have been created by illumination of the crystal with light whose energy is larger than the band gap. The signal is isotropic and corresponds to a polaron effective mass $m_p^{*}=(0.122\mathrm{}\pm 0.002)m_o$. The electron relaxation times are determined from the resonance line shape and the mobility, which is of the order of ${10}^6$ ${\mathrm{cm}}^2$ ${\mathrm{V}}^{-1\mathrm{}}$ ${\sec }^{-1\mathrm{}}$ at liquid-helium temperature, is deduced. The variation with temperature has been measured.