论文标题
创建新型倒电荷密度波状态
Creation of a novel inverted charge density wave state
论文作者
论文摘要
电荷密度波（CDW）顺序是一个新兴的量子相，其特征是定期晶格失真和电荷密度调制，通常存在于超导转换附近。在这里，我们通过使用飞秒激光器一致地过度驱动戴戴戴维型晶格扭曲的独特之星$ _2 $，从而揭示了一个新颖的反转CDW状态。我们使用时间和角度分辨光发射光谱和时间依赖性密度功能理论跟踪这种新颖的CDW状态的签名，并验证它与从未实现的独特晶格和电荷布置相关联。动态电子结构进一步揭示了其新的特性，其特征是在费米水平附近，高金属性和电子波偶联的状态密度增加。我们的结果表明，通过操纵电荷晶体订单和耦合，如何使用超快激光器在材料中创建独特的状态。
Charge density wave (CDW) order is an emergent quantum phase that is characterized by a periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here we uncover a novel inverted CDW state by using a femtosecond laser to coherently over-drive the unique star-of-David lattice distortion in 1T-TaSe$_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.
