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Title: 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:
 [1];  [2];  [3];  [1];  [2];  [3];  [4];  [4];  [5];  [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. National Taiwan Univ., Taipei (Taiwan); National Center for Theoretical Sciences, Hsinchu (Taiwan)
  3. Technische Universität Dortmund (Germany)
  4. National Institute for Materials Science, Tsukuba (Japan)
  5. 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. 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, and Andrei, Eva Y. Thu . "Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature". United States. doi: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 = {2018},
month = {6}
}

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