2022/08/19 by Sangeeta Rajpurohit, Rajpurohit, Sangeeta, Tadashi Ogitsu +3
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #Atomic physics #Ballistic conduction #Condensed matter physics #Coupling (piping) #Electron #Excitation #Excited state #FOS: Physical sciences #Ferroelectricity #Materials Science (cond-mat.mtrl-sci) #Materials science #Mechanical and Optical Resonators #Optoelectronics #Phonon #Photocurrent #Physics #Quantum mechanics #Semiconductor Quantum Structures and Devices #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2208.09545
openalex publication_date 2022/08/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the effect of local electron-phonon coupling on nonlinear optical conductivity in an interacting ferroelectric system. Using real-time simulations, we show an enhancement in nonlinear conductivity under linearly-polarized light due to generation of the phonon-assisted ballistic-current in addition to the injection-current generated by electron-hole pairs. The optically excited phonon modes generate an asymmetric carrier distribution that causes a strong directional ballistic-current. The ballistic-current enhances the photocurrent several times at above band-gap excitation frequencies and is sublinearly dependent on the excitation intensity. This strong phonon-assisted zero-frequency directional ballistic-current demonstrates an alternative way to boost the bulk photovoltaic effect (BPVE) in electronic ferroelectric materials with strong local electron-phonon coupling.