Abstract
Fano resonance between LO-phonon-coupled excited states of a Li acceptor and the valence-band state has been observed in bulk ZnSe through the infrared-absorption measurements. For the ${2P}_{5/2}({\ensuremath{\Gamma}}_{7})$ state of a Li acceptor, we found that the coupling strength of the Fano resonance $f(h{\ensuremath{\nu}}_{0})$ is 2.8 ${\mathrm{cm}}^{\ensuremath{-}1},$ the distortion parameter q is 1.07, and the spectral width of the coupled state $\ensuremath{\Gamma}$ is $16.8 {\mathrm{cm}}^{\ensuremath{-}1}.$ It is concluded that a significant feature of the resonance peak is due to strong hole LO-phonon coupling in ZnSe. The Luttinger parameters ${\ensuremath{\gamma}}_{1},$ ${\ensuremath{\gamma}}_{2},$ and ${\ensuremath{\gamma}}_{3}$ are estimated to be 6.44, 2.58, and 2.74, respectively.
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