Lightwave-driven quasiparticle collisions on a subcycle timescale.
Lightwave-driven quasiparticle collisions on a subcycle timescale.
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DOI：
10.1038/nature17958
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发表时间：
2016-05-12
期刊：
影响因子：
64.8
通讯作者：
Huber, R.
中科院分区：
文献类型：
--
作者：
Langer, F.;Hohenleutner, M.;Schmid, C. P.;Poellmann, C.;Nagler, P.;Korn, T.;Schueller, C.;Sherwin, M. S.;Huttner, U.;Steiner, J. T.;Koch, S. W.;Kira, M.;Huber, R.
自从欧内斯特·卢瑟福首次从金箔上散射α-粒子以来，碰撞实验揭示了对原子、原子核和基本粒子的独特见解。在固体中，多体相关也会导致特征共振，称为准粒子，如激子、水滴子、极化子或库珀对。它们的结构和动力学定义了壮观的宏观现象，从自发自旋和电荷顺序的莫特绝缘状态到高温超导。准粒子对撞机将极大地造福于基础研究，但准粒子众所周知的短寿命给实际解决方案带来了挑战。在这里，我们利用光波驱动的电荷输运，阿秒科学的支柱，直接在时域探索超快准粒子碰撞：飞秒光脉冲在层状二硫系钨二硒中产生激子电子-空穴对，而强太赫兹场加速并使电子与空穴碰撞。潜在的波包动力学，包括碰撞、对湮灭、量子干涉和减相，在光激发的高阶光谱边带被检测到光发射。一个完整的量子理论从微观上解释了我们的观察。这种方法为各种复杂准粒子的碰撞实验打开了大门，并提出了一种有希望的亚飞秒脉冲产生的新方法。
Ever since Ernest Rutherford first scattered α-particles from gold foils, collision experiments have revealed unique insights into atoms, nuclei, and elementary particles. In solids, many-body correlations also lead to characteristic resonances, called quasiparticles, such as excitons, dropletons, polarons, or Cooper pairs. Their structure and dynamics define spectacular macroscopic phenomena, ranging from Mott insulating states via spontaneous spin and charge order to high-temperature superconductivity. Fundamental research would immensely benefit from quasiparticle colliders, but the notoriously short lifetimes of quasiparticles have challenged practical solutions. Here we exploit lightwave-driven charge transport, the backbone of attosecond science, to explore ultrafast quasiparticle collisions directly in the time domain: A femtosecond optical pulse creates excitonic electron–hole pairs in the layered dichalcogenide tungsten diselenide while a strong terahertz field accelerates and collides the electrons with the holes. The underlying wave packet dynamics, including collision, pair annihilation, quantum interference and dephasing, are detected as light emission in high-order spectral sidebands of the optical excitation. A full quantum theory explains our observations microscopically. This approach opens the door to collision experiments with a broad variety of complex quasiparticles and suggests a promising new way of sub-femtosecond pulse generation.
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影响因子：
64.8
作者：
Almand-Hunter, A. E.;Li, H.;Koch, S. W.
通讯作者：
Koch, S. W.
影响因子：
1.6
作者：
Golde, Daniel;Kira, Mackillo;Koch, Stephan W.
通讯作者：
Koch, Stephan W.
DOI：
10.1088/0022-3719/9/12/029
发表时间：
1976-01-01
期刊：
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS
影响因子：
--
作者：
BEAL, AR;LIANG, WY
通讯作者：
LIANG, WY
影响因子：
8.6
作者：
Kono, J;Su, MY;Sakaki, H
通讯作者：
Sakaki, H
影响因子：
8.6
作者：
PEYGHAMBARIAN, N;GIBBS, HM;MYSYROWICZ, A
通讯作者：
MYSYROWICZ, A