IrTe $_2$中电荷有序相对光激发的鲁棒性
Robustness of the charge-ordered phases in IrTe$_2$ against photoexcitation
摘要：
利用时间分辨角分辨光电子能谱学研究了IrTe $_2$在低于270 K和低于180 K时的两个一级结构和电荷有序相变.研究了在电荷有序相中利用近红外飞秒脉冲光激发诱导相变的可能性。我们观察到的光谱函数的变化发生在几百飞秒和持续到几皮秒，我们解释为部分光致相变（PIPT）。光诱导这些光谱变化所需的时间随着光激发密度的增加而增加，并达到比瞬态电子温度的上升时间更长的时间尺度。我们的结论是，PIPT驱动的晶格温度从电子的能量转移后的瞬态增加。然而，光谱函数的光致变化很小，这表明低温相对光激发特别鲁棒。我们认为，系统可能被困在一个非平衡态，只有一个部分的结构转变实现。
英文摘要：
We present a time-resolved angle-resolved photoelectron spectroscopy study of IrTe$_2$, which undergoes two first-order structural and charge-ordered phase transitions on cooling below 270 K and below 180 K. The possibility of inducing a phase transition by photoexcitation with near-infrared femtosecond pulses is investigated in the charge-ordered phases. We observe changes of the spectral function occuring within a few hundreds of femtoseconds and persisting up to several picoseconds, which we interpret as a partial photoinduced phase transition (PIPT). The necessary time for photoinducing these spectral changes increases with increasing photoexcitation density and reaches timescales longer than the rise time of the transient electronic temperature. We conclude that the PIPT is driven by a transient increase of the lattice temperature following the energy transfer from the electrons. However, the photoinduced changes of the spectral function are small, which indicates that the low temperature phase is particularly robust against photoexcitation. We suggest that the system might be trapped in an out-of-equilibrium state, for which only a partial structural transition is achieved.
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