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Direct Observation of Anisotropic Coulomb Interaction in a Topological Nodal Line Semimetal
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Direct Observation of Anisotropic Coulomb Interaction in a Topological Nodal Line Semimetal
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Journal Article
Direct Observation of Anisotropic Coulomb Interaction in a Topological Nodal Line Semimetal
2025
Overview
The fundamental characteristics of collective interactions in topological band structures can be revealed by the exploration of charge screening in topological materials. In particular, distinct anisotropic screening behaviors are predicted to occur in Dirac nodal line semimetals (DNLSMs) due to their peculiar anisotropic low‐energy dispersion. Despite the recent extensive theoretical research, experimental observations of exotic charge screening in DNLSMs remain elusive, which is partly attributed to the coexisting trivial bands near the Fermi energy. This study reports the first direct observation of highly anisotropic charge‐screening behavior in the DNLSM SrAs3. Through atomically resolved conductance measurements, a highly anisotropic charge‐screening pattern around charged impurities on a surface is demonstrated. Moreover, the combination of model studies and first‐principles calculations reveals the unique nature of the screening anisotropy in DNLSMs. The results of this study are expected to pave the way for understanding the profound collective behavior of interacting low‐energy fermions in topological materials.
This research presents the first experimental evidence of unique charge screening in a Dirac nodal line semimetal. Using scanning tunneling microscopy and spectroscopy, the distinct direction‐dependent and concave‐shaped charge screening pattern around charged impurities on the surface of SrAs3 is directly observed. The unique nature of this anisotropic screening is revealed by combining these measurements with theoretical models and calculations.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
