Physics / Fizik

Permanent URI for this collectionhttps://hdl.handle.net/11147/6

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Author: search.filters.author.Bulut, NejatPublisher: search.filters.publisher.American Physical Society

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Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 10
    Citation - Scopus: 10
    Spin-Spin Correlations of Magnetic Adatoms on Graphene
    (American Physical Society, 2015) Güçlü, Alev Devrim; Bulut, Nejat; Bulut, Nejat; Güçlü, Alev Devrim; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    We study the interaction between two magnetic adatom impurities in graphene using the Anderson model. The two-impurity Anderson Hamiltonian is solved numerically by using the quantum Monte Carlo technique. We find that the interimpurity spin susceptibility is strongly enhanced at low temperatures, significantly diverging from the well-known Ruderman-Kittel-Kasuya-Yoshida result which decays as R-3.
  • Article
    Citation - WoS: 32
    Citation - Scopus: 32
    Quantum Renormalization of the Spin Hall Effect
    (American Physical Society, 2010) Gu, Bo; Bulut, Nejat; Bulut, Nejat; Ziman, Timothy; Guo, Guang-Yu; Nagaosa, Naoto; Maekawa, Sadamichi; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    By quantum Monte Carlo simulation of a realistic multiorbital Anderson impurity model, we study the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We show, for the first time, that the SOI is strongly renormalized by the quantum spin fluctuation. Based on this mechanism, we can explain why the gigantic spin Hall effect in Au with Fe impurities was observed in recent experiments, while it is not visible in the anomalous Hall effect. In addition, we show that the SOI is strongly renormalized by the Coulomb correlation U. Based on this picture, we can explain past discrepancies in the calculated orbital angular momenta for an Fe impurity in an Au host. © 2010 The American Physical Society.