Giant acceleration of polaron transport by ultrafast laser-induced coherent phonons.
Giant acceleration of polaron transport by ultrafast laser-induced coherent phonons.
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DOI：
10.1126/sciadv.adg3833
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发表时间：
2023-08-18
期刊：
影响因子：
13.6
通讯作者：
Meng, Sheng
中科院分区：
文献类型：
--
作者：
Wang, Hui-Min;Liu, Xin-Bao;Hu, Shi-Qi;Chen, Da-Qiang;Chen, Qing;Zhang, Cui;Guan, Meng-Xue;Meng, Sheng
极化子形成在极化材料中普遍存在，但严重阻碍了载流子的输运，迫切需要有效的控制方法。在这里，我们展示了激光控制的相干声子激发能够通过加速极化子在原型材料过氧化锂（Li2O2）中的输运来提高载流子迁移率的数量级。选择性激发特定声子模式，其振动模式与极化子晶格变形直接重叠，可以显著降低极化子跳变的能量垒。电子和离子子系统之间的强非绝热耦合在触发极化子迁移中起着关键作用，通过促进声子-声子在亚皮秒内的q空间散射。这些结果将我们对极化子输运动力学的理解扩展到非平衡状态，并允许具有超高开关比和超快责任的光电器件，与基于自由电子输运制造的最先进器件竞争。光控相干声子激发使极化子迁移率提高了几个数量级。
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. These results extend our understanding of polaron transport dynamics to the nonequilibrium regime and allow for optoelectronic devices with ultrahigh on-off ratio and ultrafast responsibility, competitive with those of state-of-the-art devices fabricated based on free electron transport. Light-controlled coherent phonon excitation enables orders of magnitude enhancement in polaron mobility.
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影响因子：
8.6
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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通讯作者：
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DOI：
10.1073/pnas.2113967119
发表时间：
2022-01-18
影响因子：
11.1
作者：
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通讯作者：
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