Magnetospectroscopy of high-purity InP grown by gas source molecular beam epitaxy

Magneto-photoconductivity spectra related to the bound phonons and resonant polaron effect on Si donors in high-purity InP have been investigated. Not only the transition from the $\text{1s}$ ground state to bound phonon state $\text{(1s+}\mathrm{LO})$ of Si donors, but also the antilevel crossings of the (3, 1, 0) metastable state with the bound phonon states $\text{(1s+}\mathrm{LO})$ and ${\text{(2p}}_{\text{−1}}+\mathrm{LO})$ are clearly observed in high magnetic fields. The results demonstrate the bound phonon in Si-doped InP consists of both electron and phonon via multiphonon processes and there is a resonant interaction between LO phonons and impurity-bound electrons in InP.