Kwangrae Kim, Hyun-Woo J. Kim, Seunghyeok Ha, Hoon Kim, Jin-Kwang Kim, Jaehwon Kim, Junyoung Kwon, Jihoon Seol, Saegyeol Jung, Changyoung Kim, Daisuke Ishikawa, Taishun Manjo, Hiroshi Fukui, Alfred Q. R. Baron, Ahmet Alatas, Ayman Said, Michael Merz, Matthieu Le Tacon, Jin Mo Bok, Ki-Seok Kim, B. J. Kim
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引用次数: 0
摘要
手性是指缺乏镜像对称性的结构。从亚原子粒子、分子到生物体等各种平台中都能观察到手性。然而,凝聚态系统中产生手性的内在机制一直是人们颇感兴趣的话题。在这里,我们阐明了手性电荷密度波在过渡金属二钴化物 1T-TiSe2 中的形成机制。基于对称性分析,我们证明尽管电荷密度调制和离子位移表现出相似的波矢量和强耦合,但它们遵循不同的空间群不可还原表征。这种电荷-晶格对称性挫折导致晶格畸变,进一步打破了两个扇形不通用的所有对称性。这最终产生了手性。我们的理论通过拉曼光谱和非弹性 X 射线散射得到了验证。
Origin of the chiral charge density wave in transition-metal dichalcogenide
Chirality refers to a structure that lacks mirror symmetry. It can be observed in a wide range of platforms, from subatomic particles and molecules to living organisms. However, the underlying mechanisms that give rise to chirality in condensed matter systems have been a subject of considerable interest. Here we elucidate the mechanism of chiral charge density wave formation in the transition-metal dichalcogenide 1T-TiSe2. Based on symmetry analysis, we demonstrate that charge density modulations and ionic displacements follow distinct irreducible representations of the space group, despite exhibiting similar wave vectors and a strong coupling. This charge-lattice symmetry frustration induces lattice distortions that further break all symmetries that are not common to both sectors. This ultimately gives rise to chirality. Our theory is verified using Raman spectroscopy and inelastic X-ray scattering. The mechanism of chiral symmetry breaking in condensed matter systems is not well understood. Now charge-lattice symmetry frustration has been shown to be a key factor governing chirality in a charge density wave of 1T-TiSe2.
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