一种新的电荷密度反转波态的产生
Creation of a novel inverted charge density wave state
摘要：
电荷密度波（CDW）序是一种以周期性晶格畸变和电荷密度调制为特征的量子相位，通常出现在超导跃迁附近。在这里，我们发现了一种新的反转CDW状态，通过使用飞秒激光相干过驱动独特的大卫之星晶格畸变在1 T-TaSe $_2$。我们使用时间和角度分辨的光电子能谱和时间依赖的密度泛函理论跟踪这种新的CDW状态的签名，并验证它是与一个独特的晶格和电荷排列从未实现。动态电子结构进一步揭示了其新颖的性质，其特征在于费米能级附近的态密度增加，金属丰度高，以及电子-声子耦合改变。我们的研究结果表明，超快激光可以用来创建独特的材料状态，通过操纵电荷晶格的顺序和耦合。
英文摘要：
Charge density wave (CDW) order is an emergent quantum phase that is characterized by a periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here we uncover a novel inverted CDW state by using a femtosecond laser to coherently over-drive the unique star-of-David lattice distortion in 1T-TaSe$_2$. We track the signature of this novel CDW state using time- and angle-resolved photoemission spectroscopy and time-dependent density functional theory, and validate that it is associated with a unique lattice and charge arrangement never before realized. The dynamic electronic structure further reveals its novel properties, that are characterized by an increased density of states near the Fermi level, high metallicity, and altered electron-phonon couplings. Our results demonstrate how ultrafast lasers can be used to create unique states in materials, by manipulating charge-lattice orders and couplings.
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