journal article·2024-09-17

Atomically Thin Two-Dimensional Kagome Flat Band on the Silicon Surface

Jae Hyuck Lee, Gwan Woo Kim, Inkyung Song, Yejin Kim, Yeonjae Lee, Sung Jong Yoo, Deok-Yong Cho, Jun-Won Rhim, Jongkeun Jung, Gunn Kim, Changyoung Kim

ACS Nano· Volume 18· Issue 37
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Abstract

In condensed matter physics, the Kagome lattice and its inherent flat bands have attracted considerable attention for their prediction and observation to host a variety of exotic physical phenomena. Despite extensive efforts to fabricate thin films of Kagome materials aimed at modulating flat bands through electrostatic gating or strain manipulation, progress has been limited. Here, we report the observation of a d-orbital hybridized Kagome-derived flat band in Ag/Si(111) 3 × 3 as revealed by angle-resolved photoemission spectroscopy. Our findings indicate that silver atoms on a silicon substrate form an unconventional distorted breathing Kagome structure, where a delicate balance in the hopping parameters of the in-plane d-orbitals leads to destructive interference, resulting in double flat bands. The exact quantum destructive interference mechanism that forms the flat band is uncovered in a rigorous manner that has not been described before. These results illuminate the potential for integrating metal–semiconductor interfaces on semiconductor surfaces into Kagome physics, particularly in exploring the flat bands of ideal 2D Kagome systems.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Advanced Condensed Matter Physics · Quantum, superfluid, helium dynamics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea

Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea

Department of Physics and HMC, Sejong University, Seoul 05006, Republic of Korea

Department of Physics, Jeonbuk National University, Jeonju 54896, Republic of Korea

Hydrogen·Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea

Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea

KHU−KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea

Department of Physics, Ajou University, Suwon 16499, Korea

Research Center for Novel Epitaxial Quantum Architectures, Department of Physics, Seoul National University, Seoul 08826, Korea

Center for Theoretical Physics (CTP), Seoul National University, Seoul 08826, Republic of Korea

Funding

National Research Foundation of Korea

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