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TT: Fachverband Tiefe Temperaturen
TT 6: Focus Session Many-Body Phenomena in Nanomagnets: Kondo, Spinons, Spinarons and Beyond (joint session O/TT)
TT 6.9: Hauptvortrag
Montag, 17. März 2025, 18:15–18:45, H24
Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2/Cu(111) — •Takuto Nakamura1, Hiroki Sugihara1, Yitong Chen1, Ryu Yukawa1, Yoshiyuki Ohtsubo2, Kiyohisa Tanaka3, Miho Kitamura4, Hiroshi Kumigashira5, and Shin-ichi Kimura1, 3 — 1Osaka University, Suita, Japan — 2National Institutes for Quantum Science and Technology, Sendai, Japan — 3Institute for Molecular Science, Okazaki, Japan — 4Photon Factory, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan — 5Tohoku University, Sendai, Japan
Heavy fermion (HF), which originates from the hybridization between localized f-electrons and conductive carriers via the Kondo effect, is a host of exotic physical phenomena among strongly correlated electron systems. Dimensionality in HFs is also essential for the quantum criticality between the localized and itinerant characters. However, the realization of the perfect two-dimensional (2D) HF materials is still a challenging topic. Here, we report the 2D HF in the monoatomic-layer Kondo lattice YbCu2 fabricated on a Cu(111) substrate observed with synchrotron-based photoemission spectroscopies. Our study provides a new aspect as an ideal 2D HF material for understanding the Kondo effect at low dimensions.
Keywords: Heavy fermion; Angle-resolved photoemission spectroscopy; Kondo effect; Surface electronic structure; Two-dimensinal Kondo lattice