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arXiv 0908.1807cond-mat.str-elcond-mat.quant-gas
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脱离平衡态关联电子的时间分辨光电发射

Time-resolved photoemission of correlated electrons driven out of equilibrium

B. Moritz, T. P. Devereaux, J. K. Freericks

摘要:

我们描述的时间分辨的光电子发射响应的无自旋Falicov-Kimball模型驱动的强外电场的平衡的时间演化。该模型是为数不多的具有金属-绝缘体过渡,并承认在时域的精确解。的非平衡动力学,使用扩展的动态平均场论评估,显示如何驱动系统不同于两个常见的观点-一个准平衡系统在一个升高的有效温度(“热”电子模型)或快速相互作用淬火(“熔化”的莫特间隙)-由于电子状态的重排和光谱重量的重新分配。结果表明,固有的能量和时间分辨率之间的权衡,伴随着有限宽度的探测脉冲,特征的泵浦探测时域实验中所采用的,它可以用来集中注意力在不同方面的动态附近的过渡。

英文摘要:

We describe the temporal evolution of the time-resolved photoemission response of the spinless Falicov-Kimball model driven out of equilibrium by strong applied fields. The model is one of the few possessing a metal-insulator transition and admitting an exact solution in the time domain. The nonequilibrium dynamics, evaluated using an extension of dynamical mean-field theory, show how the driven system differs from two common viewpoints - a quasiequilibrium system at an elevated effective temperature (the "hot" electron model) or a rapid interaction quench ("melting" of the Mott gap) - due to the rearrangement of electronic states and redistribution of spectral weight. The results demonstrate the inherent trade-off between energy and time resolution accompanying the finite width probe pulses, characteristic of those employed in pump-probe time-domain experiments, which can be used to focus attention on different aspects of the dynamics near the transition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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