论文标题
过渡金属二甲化物1T-TAS2中的非常规轨道电荷密度波机理
Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2
论文作者
论文摘要
由于形成丰富的密度波（DW）和超导转换，过渡金属二甲甲基1T-TAS2吸引了日益增长的注意力。然而，仍然发现了富裕温度（〜550 K）的不相称的DW状态的起源，即富含物理现象的“母体状态”。在这里，我们为基于第一原理哈伯德模型在1T-TAS2中的三Q不相关DW提供了自然解释，我们使用现场U。我们应用了Paramagnon干扰机制，该机制在基于Fe的超导体中给出了nematic order序。派生的顺序参数具有非常独特的特征：（i）轨道选择性的性质，以及（ii）动量和能量空间中的非常规的签名。本研究将有助于理解1T-TAS2、1T-VSE2和其他过渡金属二核苷的丰富物理学。
The transition metal dichalcogenide 1T-TaS2 attract growing attention because of the formation of rich density-wave (DW) and superconducting transitions. However, the origin of the incommensurate DW state at the highest temperature (~ 550 K), which is "the parent state" of the rich physical phenomena, is still uncovered. Here, we present a natural explanation for the triple-q incommensurate DW in 1T-TaS2 based on the first-principles Hubbard model with on-site U. We apply the paramagnon interference mechanism that gives the nematic order in Fe-based superconductors. The derived order parameter has very unique characters: (i) the orbital-selective nature, and (ii) the unconventional sign-reversal in both momentum and energy spaces. The present study will be useful for understanding rich physics in 1T-TaS2, 1T-VSe2, and other transition metal dichalcogenides.
