Emergence of Kondo Resonance in Graphene Intercalated with Cerium

Jinwoong Hwang; Kyoo Kim; Hyejin Ryu; Jingul Kim; Ji Eun Lee; Sooran Kim; Minhee Kang; Byeong Gyu Park; Alessandra Lanzara; Jinwook Chung; Sung Kwan Mo; Jonathan Denlinger; Byung Il Min; Choongyu Hwang

doi:10.1021/acs.nanolett.8b00784

Emergence of Kondo Resonance in Graphene Intercalated with Cerium

Jinwoong Hwang, Kyoo Kim, Hyejin Ryu, Jingul Kim, Ji Eun Lee, Sooran Kim, Minhee Kang, Byeong Gyu Park, Alessandra Lanzara, Jinwook Chung, Sung Kwan Mo, Jonathan Denlinger, Byung Il Min, Choongyu Hwang

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14 Scopus citations

Abstract

The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, E_F, hybridized with the graphene π-band, exhibit gradual increase in spectral weight upon decreasing temperature. The observed temperature dependence follows the expectations from the Kondo picture in the weak coupling limit. Our results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

Original language	English
Pages (from-to)	3661-3666
Number of pages	6
Journal	Nano Letters
Volume	18
Issue number	6
DOIs	https://doi.org/10.1021/acs.nanolett.8b00784
State	Published - 13 Jun 2018

Keywords

angle-resolved photoemission
cerium
graphene
Kondo effect

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10.1021/acs.nanolett.8b00784

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title = "Emergence of Kondo Resonance in Graphene Intercalated with Cerium",

abstract = "The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, EF, hybridized with the graphene π-band, exhibit gradual increase in spectral weight upon decreasing temperature. The observed temperature dependence follows the expectations from the Kondo picture in the weak coupling limit. Our results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.",

keywords = "angle-resolved photoemission, cerium, graphene, Kondo effect",

author = "Jinwoong Hwang and Kyoo Kim and Hyejin Ryu and Jingul Kim and Lee, {Ji Eun} and Sooran Kim and Minhee Kang and Park, {Byeong Gyu} and Alessandra Lanzara and Jinwook Chung and Mo, {Sung Kwan} and Jonathan Denlinger and Min, {Byung Il} and Choongyu Hwang",

note = "Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",

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doi = "10.1021/acs.nanolett.8b00784",

language = "English",

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AU - Hwang, Jinwoong

AU - Kim, Kyoo

AU - Ryu, Hyejin

AU - Kim, Jingul

AU - Lee, Ji Eun

AU - Kim, Sooran

AU - Kang, Minhee

AU - Park, Byeong Gyu

AU - Lanzara, Alessandra

AU - Chung, Jinwook

AU - Mo, Sung Kwan

AU - Denlinger, Jonathan

AU - Min, Byung Il

AU - Hwang, Choongyu

PY - 2018/6/13

Y1 - 2018/6/13

N2 - The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, EF, hybridized with the graphene π-band, exhibit gradual increase in spectral weight upon decreasing temperature. The observed temperature dependence follows the expectations from the Kondo picture in the weak coupling limit. Our results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

AB - The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, EF, hybridized with the graphene π-band, exhibit gradual increase in spectral weight upon decreasing temperature. The observed temperature dependence follows the expectations from the Kondo picture in the weak coupling limit. Our results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

KW - angle-resolved photoemission

KW - cerium

KW - graphene

KW - Kondo effect

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JO - Nano Letters

JF - Nano Letters

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ER -

Emergence of Kondo Resonance in Graphene Intercalated with Cerium

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Keywords

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