准一维链中涌现的电子键序波
Emergent Electronic Bond-Order Wave in a Quasi-One-Dimensional Chain
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中文总结 AI 辅助
本文报道准一维材料Ba9Rh8O24中电子键序波的涌现，通过键反转克服一维涨落建立长程有序，并表现出非线性I-V特性和忆阻开关，提出键中心电子序作为一维量子物质的新组织原理。
中文摘要 AI 辅助
集体序在一维体系中以难以稳定而著称，其中强涨落会抑制对称性破缺态。本文报道了准一维（1D）材料Ba9Rh8O24中电子键序波（BOW）的涌现，在该材料中，结构键成为活跃的电子自由度，克服了一维涨落从而建立起长程有序。单晶X射线衍射揭示了在转变温度TA = 180 K处不等价Rh-Rh键的显著反转，其中短键和长键互换身份，而非发生传统的Peierls二聚化。这种键反转与热容异常以及介电响应的深刻重组同时发生，并在冷却时强烈抑制介电损耗。该BOW表现出强非线性、频率相关的I-V特性、顺时针滞回以及非易失性忆阻开关。这些发现揭示了一种前所未有的从动态键液体到刚性但电学可重构的BOW的转变，确立了以键为中心的电子序作为一维量子物质的一种新的组织原理。
英文摘要
Collective order is notoriously difficult to stabilize in one dimension, where strong fluctuations suppress symmetry-breaking states. Here we report the emergence of an electronic bond-order wave (BOW) in the quasi-one-dimensional (1D) material Ba9Rh8O24, in which structural bonds become active electronic degrees of freedom that overcome 1D fluctuations to establish long-range order. Single-crystal X-ray diffraction uncovers a striking inversion of inequivalent Rh-Rh bonds across a transition TA = 180 K, where short and long bonds interchange their identities rather than undergoing conventional Peierls dimerization. This bond inversion coincides with a heat-capacity anomaly and a profound reorganization of the dielectric response with strong suppression of dielectric loss upon cooling. The BOW exhibits strongly nonlinear, frequency-dependent I-V characteristics, clockwise hysteresis, and nonvolatile memristive switching. These findings uncover an unprecedented transformation from a dynamic bond liquid to a rigid yet electrically reconfigurable BOW, establishing bond-centered electronic order as a new organizing principle for 1D quantum matter.
发表机构
- University of Colorado at Boulder（科罗拉多大学博尔德分校）
- Florida State University（佛罗里达州立大学）
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