Hwang, Jinwoong Lee, Seungseok Lee, Ji-Eun Kang, Minhee Ryu, Hyejin Joo, Hyun-Jeong Denlinger, Jonathan Park, Jae-Hoon Hwang, Choongyu 2024-01-19T16:30:42Z 2024-01-19T16:30:42Z 2021-09-02 2020-11 1530-6984 https://pubs.kist.re.kr/handle/201004/117955 The proximity of two different materials leads to an intricate coupling of quasiparticles so that an unprecedented electronic state is often realized at the interface. Here, we demonstrate a resonance-type many-body ground state in graphene, a nonmagnetic two-dimensional Dirac semimetal, when grown on SmB6, a Kondo insulator, via thermal decomposition of fullerene molecules. This ground state is typically observed in three-dimensional magnetic materials with correlated electrons. Above the characteristic Kondo temperature of the substrate, the electron band structure of pristine graphene remains almost intact. As temperature decreases, however, the Dirac Fermions of graphene become hybridized with the Sm 4f states. Remarkable enhancement of the hybridization and Kondo resonance is observed with further cooling and increasing charge-carrier density of graphene, evidencing the Kondo screening of the Sm 4f local magnetic moment by the conduction electrons of graphene at the interface. These findings manifest the realization of the Kondo effect in graphene by the proximity of SmB6 that is tuned by the temperature and charge-carrier density of graphene. English American Chemical Society Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator Article 10.1021/acs.nanolett.0c02751 1 Nano Letters, v.20, no.11, pp.7973 - 7979 Nano Letters 20 11 7973 7979 N scie scopus 000592495700023 2-s2.0-85095857240 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article proximity effect Kondo effect graphene SmB6 ARPES