journal article·2024-08Open access

Quasi‐Homoepitaxial Growth of Highly Strained Alkali‐Metal Ultrathin Films on Kagome Superconductors

Takemi Kato, Kosuke Nakayama, Yongkai Li, Zhiwei Wang, Katsuaki Sugawara, Kiyohisa Tanaka, Takashi Takahashi, Yugui Yao, Takafumi Sato

Advanced Science· Volume 11· Issue 29

Abstract

Abstract Applying lattice strain to thin films, a critical factor to tailor their properties such as stabilizing a structural phase unstable at ambient pressure, generally necessitates heteroepitaxial growth to control the lattice mismatch with substrate. Therefore, while homoepitaxy, the growth of thin film on a substrate made of the same material, is a useful method to fabricate high‐quality thin films, its application to studying strain‐induced structural phases is limited. Contrary to this general belief, here the quasi‐homoepitaxial growth of Cs and Rb thin films is reported with substantial in‐plane compressive strain. This is achieved by utilizing the alkali‐metal layer existing in bulk crystal of kagome metals AV3Sb5 (A = Cs and Rb) as a structural template. The angle‐resolved photoemission spectroscopy measurements reveal the formation of metallic quantum well states and notable thickness‐dependent quasiparticle lifetime. Comparison with density functional theory calculations suggests that the obtained thin films crystalize in the face‐centered cubic structure, which is typically stable only under high pressure in bulk crystals. These findings provide a useful approach for synthesizing highly strained thin films by quasi‐homoepitaxy, and pave the way for investigating many‐body interactions in Fermi liquids with tunable dimensionality.
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Research context

OpenAlex topics: Physics of Superconductivity and Magnetism · Topological Materials and Phenomena · Advanced Condensed Matter Physics

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

Affiliations

Department of Physics Graduate School of Science Tohoku University Sendai 980–8578 Japan

Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 P. R. China

Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 P. R. China

Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 P. R. China

Precursory Research for Embryonic Science and Technology (PRESTO) Japan Science and Technology Agency (JST) Tokyo 102‐0076 Japan

Advanced Institute for Materials Research (WPI‐AIMR) Tohoku University Sendai 980–8577 Japan

UVSOR Synchrotron Facility Institute for Molecular Science Okazaki 444–8585 Japan

School of Physical Sciences The Graduate University for Advanced Studies (SOKENDAI) Okazaki 444–8585 Japan

Center for Science and Innovation in Spintronics (CSIS) Tohoku University Sendai 980–8577 Japan

International Center for Synchrotron Radiation Innovation Smart (SRIS) Tohoku University Sendai 980–8577 Japan

Mathematical Science Center for Co‐creative Society (MathCCS) Tohoku University Sendai 980–8578 Japan

Funding

Japan Science and Technology Agency · Core Research for Evolutional Science and Technology · Japan Society for the Promotion of Science · Japan Science Society · National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality

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