Attosecond Control of Restoration of Electronic Structure Symmetry
Attosecond Control of Restoration of Electronic Structure Symmetry
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电子结构对称性恢复的阿秒控制
DOI：
10.1103/physrevlett.121.173201
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发表时间：
2018
影响因子：
8.6
通讯作者：
Yichi Zhang
中科院分区：
文献类型：
--
作者：
ChunMei Liu;Jörn Manz;Kenji Ohmori;Christian Sommer;Nobuyuki Takei;Jean Christophe Tremblay;Yichi Zhang
激光脉冲通过制备具有不同不可约表示的态的叠加态，可以打破原子和分子的电子结构对称性。本文利用两个圆偏振激光脉冲，发现了对称性恢复的逆过程。对称性恢复脉冲被设计成对称性破缺脉冲的复制脉冲。如果选择时间延迟使得叠加态在时间中心具有相同的相位，则可以实现对称性恢复。这个条件必须以几阿秒的精度来满足。本文对C_6H_6分子和~（87）Rb原子进行了数值模拟。通过对~（87）Rb原子的高对比度含时Ramsey干涉术，证明了对称性恢复的实验可行性。
Laser pulses can break the electronic structure symmetry of atoms and molecules by preparing a.superposition of states with different irreducible representations. Here, we discover the reverse process,.symmetry restoration, by means of two circularly polarized laser pulses. The laser pulse for symmetry.restoration is designed as a copy of the pulse for symmetry breaking. Symmetry restoration is achieved if.the time delay is chosen such that the superposed states have the same phases at the temporal center. This.condition must be satisfied with a precision of a few attoseconds. Numerical simulations are presented for.the C6H6 molecule and 87Rb atom. The experimental feasibility of symmetry restoration is demonstrated by.means of high-contrast time-dependent Ramsey interferometry of the 87Rb atom.