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yexuqing木虫之王 (文学泰斗)
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Electronic bound states in the continuum in a two-dimensional metal
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Electronic bound states in the continuum in a two-dimensional metal 二维金属中的电子连续谱束缚态 ▲ 作者：MORGAN THINEL, XIONG HUANG, DANIEL G. CHICA, SIMON TURKEL, SEBASTIAN E. ROSSI, CHRISTIE S. KOAY, HONG LI, WILLA MIHALYI-KOCH, BIPASA SAMANTA, AND RAQUEL QUEIROZ ▲链接： https://www.science.org/doi/10.1126/science.adt9825 ▲摘要： 尽管位于延展、离域态的连续谱之内，连续谱束缚态（BIC）却仍保持局域的量子态。光学BIC已在光子系统中实现，而在金属背景中实现电子束缚态仍是一项持续存在的挑战。 研究者利用扫描隧道显微镜识别出两种缺陷诱导的电子态。它们在Pd5AlI2（一种二维范德华金属）的金属连续谱内保持局域。 计算表明，Pd5AlI2装饰性棋盘格晶格上的电子跳跃干涉产生了一个（准）平带，该平带由与色散连续谱正交的空间局域本征态构成。这一阻挫晶格内的原子缺陷将相关的平带局域态移入金属连续谱，形成稳健的、对称性保护的BIC。 ▲ Abstract： Bound states in the continuum (BICs) are quantum states that remain localized despite lying within a continuum of extended, delocalized states. Whereas optical BICs have been realized in photonic systems, achieving electronic bound states embedded in a metallic background remains an ongoing challenge. In this study, we used scanning tunneling microscopy to identify two defect-induced electronic states that remain localized within the metallic continuum of Pd5AlI2, a two-dimensional van der Waals metal. Our calculations suggest that electron-hopping interference on the decorated checkerboard lattice of Pd5AlI2 gives rise to a (quasi) flat band built from spatially localized eigenstates that are orthogonal to the dispersive continuum. Atomic defects within this frustrated lattice shift the associated flat-band localized states into the metallic continuum, forming robust, symmetry-protected BICs. |
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