电子轨道量子干涉的太赫兹辐射
Terahertz Emisssion from Quantum Interference of Electron Trajectories
摘要：
采用半经典电子轨道即量子轨道理论解释双色强场中的太赫兹波产生，并通过实验验证了理论的可行性。我们发现TWG源于双色电场相邻周期处释放的部分电子波包的量子路径干涉，表现为单电子的时间杨氏双缝干涉，相邻周期处释放的轨道产生TWG，也解释了光电子动量分布中的周期间干涉条纹，而当仅从单个循环获取轨迹时，没有发现TWG的特征。
英文摘要：
The semiclassical electron trajectory, the so-called quantum orbits, is employed to explain the terahertz wave generation (TWG) in dual-color strong field, and the feasibility of the theory is validated by the measurement. We find that TWG stems from quantum path interference of partial electron wavepacket released at the neighbouring cycles of the dual-color electric field, manifesting the temporal Young's double-slit interference of single electron. The trajectories released from neighbouring cycles, creating TWG, also account for intercycle interference fringes in the photoelectron momentum distribution, whereas no signature of TWG is found when taking trajectories only from a single cycle.
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