Theory of time-resolved Raman scattering in correlated systems: Ultrafast engineering of spin dynamics and detection of thermalization
Theory of time-resolved Raman scattering in correlated systems: Ultrafast engineering of spin dynamics and detection of thermalization
复制标题
相关系统中的时间分辨拉曼散射理论：自旋动力学的超快工程和热化检测
DOI：
10.1103/physrevb.98.245106
复制
发表时间：
2018
期刊：
影响因子：
1.7
通讯作者：
Chen, Cheng-Chien
中科院分区：
文献类型：
--
作者：
Wang, Yao;Devereaux, Thomas P.;Chen, Cheng-Chien
多体相互作用和基元激发的超快表征和控制对于理解和操纵强关联系统中的涌现现象至关重要。特别是，自旋相互作用在非常规超导中起着重要的作用，但仍然缺乏探测自旋动力学，特别是脱离平衡的有效工具。为了解决这个问题，我们发展了一个理论，非共振时间分辨拉曼散射，这可以是一个通用的和强大的工具，非平衡研究。我们还利用精确对角化方法模拟了正方晶格单带Hubbard模型中关联电子的泵浦-探测动力学。不同的超快过程被证明存在于时间分辨的拉曼光谱中，并在不同的泵浦条件下占主导地位。对于高频和非共振泵，我们表明，Floquet理论在捕获软化的双磁振子激发。通过比较斯托克斯和反斯托克斯光谱，我们还表明，有效加热占主导地位，在小泵浦注量，而相干多体效应开始接管在较大的泵浦振幅和频率上的共振莫特间隙。因此，时间分辨拉曼散射提供了一个平台，以探索不同的超快过程和设计材料的性质不平衡。
Ultrafast characterization and control of many-body interactions and elementary excitations are critical to understanding and manipulating emergent phenomena in strongly correlated systems. In particular, spin interaction plays an important role in unconventional superconductivity, but efficient tools for probing spin dynamics, especially out of equilibrium, are still lacking. To address this question, we develop a theory for nonresonant time-resolved Raman scattering, which can be a generic and powerful tool for nonequilibrium studies. We also use exact diagonalization to simulate the pump-probe dynamics of correlated electrons in the square-lattice single-band Hubbard model. Different ultrafast processes are shown to exist in the time-resolved Raman spectra and dominate under different pump conditions. For high-frequency and off-resonance pumps, we show that the Floquet theory works well in capturing the softening of bimagnon excitation. By comparing the Stokes and anti-Stokes spectra, we also show that effective heating dominates at small pump fluences, while a coherent many-body effect starts to take over at larger pump amplitudes and frequencies on resonance to the Mott gap. Time-resolved Raman scattering thereby provides the platform to explore different ultrafast processes and design material properties out of equilibrium.
登录
查看更多内容
影响因子：
8.6
作者：
Mentink, J. H.;Eckstein, M.
通讯作者：
Eckstein, M.
影响因子：
64.8
作者：
Mitrano M;Cantaluppi A;Nicoletti D;Kaiser S;Perucchi A;Lupi S;Di Pietro P;Pontiroli D;Riccò M;Clark SR;Jaksch D;Cavalleri A
通讯作者：
Cavalleri A
影响因子：
8.6
作者：
Takashi Mori;Tomotaka Kuwahara;Keiji Saito
通讯作者：
Takashi Mori;Tomotaka Kuwahara;Keiji Saito
影响因子：
35
作者：
Batignani, G.;Bossini, D.;Scopigno, T.
通讯作者：
Scopigno, T.
剩余莫特间隙和磁振子激发的真实空间可视化。
影响因子：
8.6
作者：
Y. Wang;C. Jia;B. Moritz;T. Devereaux
通讯作者：
T. Devereaux