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Ultrafast dissolution and creation of bonds in IrTe2 induced by photodoping

机译：光掺杂在IrTe2中超快溶解和形成键

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The observation and control of interweaving spin, charge, orbital, and structural degrees of freedom in materials on ultrafast time scales reveal exotic quantum phenomena and enable new active forms of nanotechnology. Bonding is the prime example of the relation between electronic and nuclear degrees of freedom. We report direct evidence illustrating that photoexcitation can be used for ultrafast control of the breaking and recovery of bonds in solids on unprecedented time scales, near the limit for nuclear motions. We describe experimental and theoretical studies of IrTe2 using femtosecond electron diffraction and density functional theory to investigate bonding instability. Ir-Ir dimerization shows an unexpected fast dissociation and recovery due to the filling of the antibonding dxy orbital. Bond length changes of 20% in IrTe2 are achieved by effectively addressing the bonds directly through this relaxation process. These results could pave the way to ultrafast switching between metastable structures by photoinduced manipulation of the relative degree of bonding in this manner.
机译：在超快时间尺度上观察和控制交织的自旋，电荷，轨道和结构自由度揭示了奇特的量子现象，并实现了新的活性形式的纳米技术。键合是电子自由度与核自由度之间关系的主要示例。我们报道的直接证据表明，光激发可用于超快控制固体中键的断裂和恢复，且时间空前，接近核运动的极限。我们使用飞秒电子衍射和密度泛函理论描述IrTe2的实验和理论研究，以研究键合的不稳定性。 Ir-Ir二聚化由于反键dxy轨道的填充而显示出乎意料的快速解离和恢复。通过直接通过松弛过程有效处理键，可实现IrTe2中键长变化20％。这些结果可以通过以这种方式对相对键合度进行光诱导的操纵，为亚稳结构之间的超快切换铺平道路。

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