Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature
Abstract
In normal metals the magnetic moment of impurity-spins disappears below a characteristic Kondo temperature which marks the formation of a cloud of conduction-band electrons that screen the local-moment. In contrast, moments embedded in insulators remain unscreened at all temperatures. What then is the fate of magnetic-moments in intermediate, pseudogap systems, such as graphene? Theory predicts that coupling to the conduction-band electrons will drive a quantum phase transition between a local-moment phase and a Kondo-screened phase. However, attempts to experimentally confirm this prediction and its intriguing consequences, such as electrostatically tunable magnetic-moments, have been elusive. Here we report the observation of Kondo-screening and the quantum phase-transition between screened and unscreened phases of vacancy magnetic moments in graphene. Using scanning tunneling spectroscopy and numerical renormalization-group calculations we show that this transition enables to control the screening of local moments by tuning the gate voltage and the local curvature of the graphene membrane.
- Authors:
-
- Rutgers Univ., Piscataway, NJ (United States)
- National Taiwan Univ., Taipei (Taiwan); National Center for Theoretical Sciences, Hsinchu (Taiwan)
- Technische Universität Dortmund (Germany)
- National Institute for Materials Science, Tsukuba (Japan)
- Rutgers Univ., Piscataway, NJ (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Publication Date:
- Research Org.:
- Rutgers Univ., Piscataway, NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1511591
- Grant/Contract Number:
- FG02-99ER45742
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Jiang, Yuhang, Lo, Po-Wei, May, Daniel, Li, Guohong, Guo, Guang-Yu, Anders, Frithjof B., Taniguchi, Takashi, Watanabe, Kenji, Mao, Jinhai, and Andrei, Eva Y. Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature. United States: N. p., 2018.
Web. doi:10.1038/s41467-018-04812-6.
Jiang, Yuhang, Lo, Po-Wei, May, Daniel, Li, Guohong, Guo, Guang-Yu, Anders, Frithjof B., Taniguchi, Takashi, Watanabe, Kenji, Mao, Jinhai, & Andrei, Eva Y. Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature. United States. https://doi.org/10.1038/s41467-018-04812-6
Jiang, Yuhang, Lo, Po-Wei, May, Daniel, Li, Guohong, Guo, Guang-Yu, Anders, Frithjof B., Taniguchi, Takashi, Watanabe, Kenji, Mao, Jinhai, and Andrei, Eva Y. Thu .
"Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature". United States. https://doi.org/10.1038/s41467-018-04812-6. https://www.osti.gov/servlets/purl/1511591.
@article{osti_1511591,
title = {Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature},
author = {Jiang, Yuhang and Lo, Po-Wei and May, Daniel and Li, Guohong and Guo, Guang-Yu and Anders, Frithjof B. and Taniguchi, Takashi and Watanabe, Kenji and Mao, Jinhai and Andrei, Eva Y.},
abstractNote = {In normal metals the magnetic moment of impurity-spins disappears below a characteristic Kondo temperature which marks the formation of a cloud of conduction-band electrons that screen the local-moment. In contrast, moments embedded in insulators remain unscreened at all temperatures. What then is the fate of magnetic-moments in intermediate, pseudogap systems, such as graphene? Theory predicts that coupling to the conduction-band electrons will drive a quantum phase transition between a local-moment phase and a Kondo-screened phase. However, attempts to experimentally confirm this prediction and its intriguing consequences, such as electrostatically tunable magnetic-moments, have been elusive. Here we report the observation of Kondo-screening and the quantum phase-transition between screened and unscreened phases of vacancy magnetic moments in graphene. Using scanning tunneling spectroscopy and numerical renormalization-group calculations we show that this transition enables to control the screening of local moments by tuning the gate voltage and the local curvature of the graphene membrane.},
doi = {10.1038/s41467-018-04812-6},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Thu Jun 14 00:00:00 EDT 2018},
month = {Thu Jun 14 00:00:00 EDT 2018}
}
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