Visualizing the Charge Density Wave Transition in 2H-NbSe2 in Real Space
S. P. Chockalingam, C. J. Arguello, E. P. Rosenthal, L. Zhao, C. Gutiérrez, J. H. Kang, W. C. Chung, R. M. Fernandes, S. Jia, A. J. Millis, R. J. Cava, A. N. Pasupathy
备注：
Main text: 5 pages, 4 Figures. Supplementary material included: 8 pages, 8 Figures
We report the direct observation in real space of the charge density wave (CDW) phase transition in pristine 2H-NbSe2 using atomic-resolution scanning tunneling microscopy (STM). We find that static CDW order is established in nanoscale regions in the vicinity of defects at temperatures that are several times the bulk transition temperature Tcdw. On lowering the temperature, the correlation length of these patches increases steadily until CDW order is established in all of space, demonstrating the crucial role played by defects in the physics of the transition region. The nanoscale CDW order has an energy and temperature-independent wavelength. Spectroscopic imaging measurements of the real-space phase of the CDW indicate that an energy gap in NbSe2 occurs at 0.7eV below the Fermi energy in the CDW phase, suggesting that strong electron-lattice interactions and not Fermi surface physics is the dominant cause for CDW formation in NbSe2.
Visualizing the atomic-scale origin of metallic behavior in Kondo insulators
近藤晶格通常在低温下是电绝缘的。然而，最近的几个实验已经检测到在近藤绝缘相内的大量金属性的签名。在这里，我们可视化的真实空间电荷景观内的近藤晶格原子分辨率使用扫描隧道显微镜。我们发现了纳米级的金属导电电子的水坑周围的铀现场取代重费米子化合物URu $_2$ Si $_2$，周围的钐现场缺陷的拓扑近藤绝缘体SmB $_6$。这些缺陷扰乱了近藤屏蔽云，留下了金属母态的指纹。我们的研究结果表明，神秘的三维量子振荡测量的钐$_6$可能会产生这些近藤晶格缺陷，虽然我们不能排除其他的解释。我们的成像技术可以使原子尺度的电荷传感器的发展，使用重费米子探针。
Visualizing the melting of the charge density wave in UTe2 by generation of pairs of topological defects with opposite winding
Institute for Condensed Matter Theory, University of Illinois（伊利诺伊大学凝聚态理论研究所）；Maryland Quantum Materials Center, Department of Physics, University of Maryland（马里兰大学物理系马里兰量子材料中心）；NIST Center for Neutron Research, National Institute of Standards and Technology（美国国家标准与技术研究院中子研究中心）；Department of Physics, Washington University in St. Louis（圣路易斯华盛顿大学物理系）；Canadian Institute for Advanced Research（加拿大高级研究院）
Anyon Bosonization of 2D Fermions and Single Boson Phase Diagram Implied from Experiment on Visualizing Pair Formation in Superconductor Bi_2Sr_2CaCu_2O_{8+δ}
Visualizing impurity-driven scattering phase textures in EuCd2As2
Universidad Autónoma de Madrid（马德里自治大学）；Universidad Nacional de Colombia（哥伦比亚国立大学）；Goethe Universität Frankfurt（法兰克福歌德大学）；Ames Laboratory and Department of Physics & Astronomy, Iowa State University（爱荷华州立大学 Ames 实验室与物理及天文学系）
Visualizing the low-energy electronic structure of the triplet superconductor UTe$_2$ through quasiparticle interference
Harvard University（哈佛大学）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；University of Maryland, College Park（马里兰大学帕克分校）；National Institute of Standards and Technology（美国国家标准与技术研究院）；Washington University in St. Louis（圣路易斯华盛顿大学）；Canadian Institute for Advanced Research（加拿大高级研究院）
Bridging atomic and mesoscopic length scales with Replica Scanning Tunneling Microscopy: Visualizing the atomic lattice of UTe$_2$ and the atomic scale superconducting gap modulations of FeSe close to micron length scales
Universidad Autónoma de Madrid（马德里自治大学）；Universidad del Rosario（罗萨里奥大学）
