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BiTeI is a giant Rashba spin splitting system, in which a non-centrosymmetric topological phase has recently been suggested to appear under highpressure. We investigated the optical properties of this compound, reflectivityand transmission, under pressures up to $15$ GPa. The gap feature in theoptical conductivity vanishes above $p \sim 9$ GPa and does not reappear up toat least $15$ GPa. The plasma edge, associated with intrinsically doped chargecarriers, is smeared out through a phase transition at $9$ GPa. Using highpressure Raman spectroscopy, we follow the vibrational modes of BiTeI,providing additional clear evidence that the transition at 9 GPa involves achange of crystal structure. This change of crystal structure possibly inhibitsthe high-pressure topological phase from occurring.

Infrared and Raman spectroscopy measurements of a transition in the crystal structure and a closing of the energy gap of BiTeI under pressure