Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator
Abstract
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 in this work. 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.
- Authors:
-
[5];
[4]
- Pusan National Univ., Busan (Korea, Republic of); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Max Planck POSTECH/Korea Research Initiative, Pohang (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
- Pusan National Univ., Busan (Korea, Republic of); Korea Institute of Science and Technology (KIST), Seoul (Korea, Republic of)
- Pusan National Univ., Busan (Korea, Republic of)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Max Planck POSTECH/Korea Research Initiative, Pohang (Korea, Republic of); Korea Institute of Science and Technology (KIST), Seoul (Korea, Republic of)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)
- OSTI Identifier:
- 1845817
- Grant/Contract Number:
- AC02-05CH11231; 2018R1A2B6004538; 2020K1A3A7A09080369
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 20; Journal Issue: 11; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; proximity effect; Kondo effect; graphene; SmB6; ARPES
Citation Formats
Hwang, Jinwoong, Lee, Seungseok, Lee, Ji-Eun, Kang, Minhee, Ryu, Hyejin, Joo, Hyun-Jeong, Denlinger, Jonathan, Park, Jae-Hoon, and Hwang, Choongyu. Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator. United States: N. p., 2020.
Web. doi:10.1021/acs.nanolett.0c02751.
Hwang, Jinwoong, Lee, Seungseok, Lee, Ji-Eun, Kang, Minhee, Ryu, Hyejin, Joo, Hyun-Jeong, Denlinger, Jonathan, Park, Jae-Hoon, & Hwang, Choongyu. Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator. United States. https://doi.org/10.1021/acs.nanolett.0c02751
Hwang, Jinwoong, Lee, Seungseok, Lee, Ji-Eun, Kang, Minhee, Ryu, Hyejin, Joo, Hyun-Jeong, Denlinger, Jonathan, Park, Jae-Hoon, and Hwang, Choongyu. Mon .
"Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator". United States. https://doi.org/10.1021/acs.nanolett.0c02751. https://www.osti.gov/servlets/purl/1845817.
@article{osti_1845817,
title = {Tunable Kondo Resonance at a Pristine Two-Dimensional Dirac Semimetal on a Kondo Insulator},
author = {Hwang, Jinwoong and Lee, Seungseok and Lee, Ji-Eun and Kang, Minhee and Ryu, Hyejin and Joo, Hyun-Jeong and Denlinger, Jonathan and Park, Jae-Hoon and Hwang, Choongyu},
abstractNote = {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 in this work. 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.},
doi = {10.1021/acs.nanolett.0c02751},
journal = {Nano Letters},
number = 11,
volume = 20,
place = {United States},
year = {Mon Oct 26 00:00:00 EDT 2020},
month = {Mon Oct 26 00:00:00 EDT 2020}
}
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