Scholarlink

<p>The spatial modulation of electron density into a wave-like pattern, known as charge density wave (CDW), represents a fundamental quantum state that often coexists with superconductivity, quantum Hall states and axion insulating phases. Conventional CDWs are mediated by longitudinal acoustic phonons, exhibit picometer-scale lattice distortions (10<sup>−12</sup>−10<sup>−11 </sup>m), and typically vanish upon approaching the atomic limit. Here, we report a series of anomalous CDW behaviors in the 2D superatomic superconductor Au<sub>6</sub>Te<sub>12</sub>Se<sub>8</sub>. Remarkably, its CDW is governed by transverse phonons and exhibits a real-space displacement of ~ 4 Ångström, which is an order of magnitude larger than that in conventional CDW. Furthermore, we observe a dimensional response persisting up to micrometer-scale thickness, a regime where other materials are already considered as bulk. Through liquid helium-temperature transmission electron microscopy, ultrafast pump-probe spectroscopy and transport measurements, we demonstrate a prominent enhancement of the CDW transition temperature (<i>T</i><sub>CDW</sub>) from &lt; 2 K in the bulk to 110 K upon approaching the “superatomic limit”. Our findings not only reveal anomalous facets of both CDW and superatomic materials, but the competition between this anomalous CDW and superconductivity opens avenues for exploring unconventional electron-phonon interactions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Anomalous charge density wave in a two-dimensional superatomic superconductor

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月22日

查看全文
  • Boqin Song,
  • Shuaishuai Sun,
  • Zhongxu Wei,
  • Xinbo Wang,
  • Xiaoping Ma,
  • Kaifa Luo,
  • Lei Wang,
  • Jun Deng,
  • Xu Chen,
  • Tian Qian,
  • Shuya Xing,
  • Zhihai Cheng,
  • Jian-gang Guo,
  • Tianping Ying,
  • Xiaolong Chen

摘要

The spatial modulation of electron density into a wave-like pattern, known as charge density wave (CDW), represents a fundamental quantum state that often coexists with superconductivity, quantum Hall states and axion insulating phases. Conventional CDWs are mediated by longitudinal acoustic phonons, exhibit picometer-scale lattice distortions (10−12−10−11 m), and typically vanish upon approaching the atomic limit. Here, we report a series of anomalous CDW behaviors in the 2D superatomic superconductor Au6Te12Se8. Remarkably, its CDW is governed by transverse phonons and exhibits a real-space displacement of ~ 4 Ångström, which is an order of magnitude larger than that in conventional CDW. Furthermore, we observe a dimensional response persisting up to micrometer-scale thickness, a regime where other materials are already considered as bulk. Through liquid helium-temperature transmission electron microscopy, ultrafast pump-probe spectroscopy and transport measurements, we demonstrate a prominent enhancement of the CDW transition temperature (TCDW) from < 2 K in the bulk to 110 K upon approaching the “superatomic limit”. Our findings not only reveal anomalous facets of both CDW and superatomic materials, but the competition between this anomalous CDW and superconductivity opens avenues for exploring unconventional electron-phonon interactions.