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您的检索式：作者名="Dongbin Shin"
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| 1 | Dynamical amplification of electric polarization through nonlinear phononics in 2D SnTe显示文摘Ultrafast optical control of ferroelectricity using intense terahertz fields has attracted significant interest.Here we show that the nonlinear interactions between two optical phonons in SnTe,a two-dimensional in-plane ferroelectric material,enables a dynamical amplification of the electric polarization within subpicoseconds time domain.Our first-principles time-dependent simulations show that the infrared-active out-of-plane phonon mode,pumped to nonlinear regimes,spontaneously generates in-plane motions,leading to rectified oscillations in the in-plane electric polarization.We suggest that this dynamical control of ferroelectric material,by nonlinear phonon excitation,can be utilized to achieve ultrafast control of the photovoltaic or other nonlinear optical responses. | Dongbin Shin Shunsuke A.Sato Hannes Hübener Umberto De Giovannini Noejung Park Angel Rubio | 2020 | npj Computational Materials2020，，1： | 0 |
| 2 | Releasing the hidden shift current in the TTF-CA organic molecular solid via symmetry lowering显示文摘Bulk photovoltaic effect,characterized by an excitation-driven unbiased spontaneous photocurrent,has attracted substantial attention mainly due to its potential for harvesting solar energy.Here,we investigate the photovoltaic characteristics of organic molecular solids and focus on the association between the photocurrent and the crystal symmetry in the exemplary case of tetrathiafulvalene-p-chloranil.We perform comprehensive first-principles calculations,including direct evaluations of the excitedstate current via real-time propagations of the time-dependent density functional theory.We find that the charge shifting in the low-temperature phase is mainly driven by the intrachain ferroelectricity,which gives rise to a photocurrent not only in the visiblelight range but also near the band-edge infrared region.The shift current that is locked in the symmetry of the high-temperature phase can be released by introducing a potential asymmetry.We suggest that organic molecular solids can be exploited via appropriate engineering to lower the symmetry,aiming at room-temperature photovoltaics. | Bumseop Kim Jeongwoo Kim Dongbin Shin Min Choi Junhee Lee Noejung Park | 2020 | npj Computational Materials2020，，1： | 0 |
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