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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, 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. These results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [1];  [5];  [1];  [6];  [7];  [8]; ORCiD logo [9];  [9];  [4]; ORCiD logo [1]
  1. Pusan National Univ., Busan (Korea, Republic of). Dept. of Physics
  2. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Max Planck-POSTECH/Hsinchu Center for Complex Phase Materials
  3. Pusan National Univ., Busan (Korea, Republic of). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Korea Inst. of Science and Technology, Seoul (Korea, Republic of). Center for Spintronics
  4. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics
  5. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Max Planck-POSTECH/Hsinchu Center for Complex Phase Materials and Dept. of Physics
  6. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Pohang Accelerator Lab.
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  8. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics; Gwangju Inst. of Science and Technology (Korea, Republic of). Dept. of Physics and Photon Science
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Research Foundation of Korea (NRF)
OSTI Identifier:
1465459
Grant/Contract Number:  
[AC02-05CH11231; 2015R1C1A1A01053065; 2017K1A3A7A09016384; 2018R1A2B6004538; 2016K1A4A4A01922028; 2016R1D1A1B02008461; NRF-2017M2A2A6A01071297; 2017R1A2B4005175; NRF-2015R1A5A1009962]
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
[ Journal Volume: 18; Journal Issue: 6; Related Information: Copyright © 2018 American Chemical Society.]; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; angle-resolved photoemission; cerium; graphene; Kondo effect

Citation Formats

Hwang, Jinwoong, Kim, Kyoo, Ryu, Hyejin, Kim, Jingul, Lee, Ji-Eun, Kim, Sooran, Kang, Minhee, Park, Byeong-Gyu, Lanzara, Alessandra, Chung, Jinwook, Mo, Sung-Kwan, Denlinger, Jonathan, Min, Byung Il, and Hwang, Choongyu. Emergence of Kondo Resonance in Graphene Intercalated with Cerium. United States: N. p., 2018. Web. doi:10.1021/acs.nanolett.8b00784.
Hwang, Jinwoong, Kim, Kyoo, Ryu, Hyejin, Kim, Jingul, Lee, Ji-Eun, Kim, Sooran, Kang, Minhee, Park, Byeong-Gyu, Lanzara, Alessandra, Chung, Jinwook, Mo, Sung-Kwan, Denlinger, Jonathan, Min, Byung Il, & Hwang, Choongyu. Emergence of Kondo Resonance in Graphene Intercalated with Cerium. United States. doi:10.1021/acs.nanolett.8b00784.
Hwang, Jinwoong, Kim, Kyoo, Ryu, Hyejin, Kim, Jingul, Lee, Ji-Eun, Kim, Sooran, Kang, Minhee, Park, Byeong-Gyu, Lanzara, Alessandra, Chung, Jinwook, Mo, Sung-Kwan, Denlinger, Jonathan, Min, Byung Il, and Hwang, Choongyu. Tue . "Emergence of Kondo Resonance in Graphene Intercalated with Cerium". United States. doi:10.1021/acs.nanolett.8b00784. https://www.osti.gov/servlets/purl/1465459.
@article{osti_1465459,
title = {Emergence of Kondo Resonance in Graphene Intercalated with Cerium},
author = {Hwang, Jinwoong and Kim, Kyoo and Ryu, Hyejin and Kim, Jingul and Lee, Ji-Eun and Kim, Sooran and Kang, Minhee and Park, Byeong-Gyu and Lanzara, Alessandra and Chung, Jinwook and Mo, Sung-Kwan and Denlinger, Jonathan and Min, Byung Il and Hwang, Choongyu},
abstractNote = {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. These results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.},
doi = {10.1021/acs.nanolett.8b00784},
journal = {Nano Letters},
number = [6],
volume = [18],
place = {United States},
year = {2018},
month = {5}
}

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