Enhancement of the Bulk Photovoltaic Effect in Topological Insulators

Liang Z. Tan, Andrew M. Rappe
2016 Physical Review Letters  
We investigate the shift current bulk photovoltaic response of materials close to a band inversion topological phase transition. We find that the bulk photocurrent reverses direction across the band inversion transition, and that its magnitude is enhanced in the vicinity of the phase transition. These results are demonstrated with first principles DFT calculations of BiTeI and CsPbI_3 under hydrostatic pressure, and explained with an analytical model, suggesting that this phenomenon remains
more » ... nomenon remains robust across disparate material systems.
doi:10.1103/physrevlett.116.237402 pmid:27341257 fatcat:w7gcqlvuenbdvp27hnyceyuntm