Giant acceleration of polaron transport by ultrafast laser-induced coherent phonons.

ABSTRACT: Polaron formation is ubiquitous in polarized materials, but severely hampers carrier transport for which effective controlling methods are urgently needed. Here, we show that laser-controlled coherent phonon excitation enables orders of magnitude enhancement of carrier mobility via accelerating polaron transport in a prototypical material, lithium peroxide (Li₂O₂). The selective excitation of specific phonon modes, whose vibrational pattern directly overlap with the polaronic lattice deformation, can remarkably reduce the energy barrier for polaron hopping. The strong nonadiabatic couplings between the electronic and ionic subsystem play a key role in triggering the migration of polaron, via promoting phonon-phonon scattering in q space within sub-picoseconds.

SUBMITTER: Wang HM 

PROVIDER: S-EPMC10431702 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature