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Quantum phase transitions into Kondo states in bilayer graphene

机译:双层石墨烯中的量子相转变为近藤态

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摘要

We study a magnetic impurity intercalated in bilayer graphene. A representative configuration generates a hybridization function with strong dependence on the conduction-electron energy, including a full gap with one hard and one soft edge. Shifts of the chemical potential via gating or doping drive the system between non-Kondo (free-moment) and Kondo-screened phases, with strong variation of the Kondo scale. Quantum phase transitions near the soft edge are of Kosterlitz-Thpuless type, while others are first order. Near the hard edge, a bound-state singlet appears inside the gap; although of single-particle character, its signatures in scanning tunneling spectrpscopy are very similar to those arising from a many-body Kondo resonance.
机译:我们研究了嵌入石墨烯双层中的磁性杂质。代表性的配置产生了对传导电子能量的强烈依赖性的杂交功能,包括具有一个硬边缘和一个软边缘的完整间隙。通过门控或掺杂产生的化学势的变化会在非近藤(自由矩)相和经过近藤筛选的相之间驱动系统,而近藤比例会发生很大变化。软边缘附近的量子相变是Kosterlitz-Thpuless型的,而其他则是一阶的。在硬边附近,缝隙内出现束缚态单重态。尽管具有单粒子特征,但其在扫描隧道光谱中的签名与多体近藤共振产生的签名非常相似。

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  • 来源
    《Physical review》 |2014年第8期|081101.1-081101.5|共5页
  • 作者单位

    Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA ,Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universitaet Berlin, 14195 Berlin, Germany;

    Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA;

    Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA;

    Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA ,Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universitaet Berlin, 14195 Berlin, Germany;

    Department of Physics and Astronomy, and Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA ,Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universitaet Berlin, 14195 Berlin, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    scattering mechanisms and kondo effect; local moment in compounds and alloys; kondo effect, valence fluctuations, heavy fermions;

    机译:散射机制和近藤效应;化合物和合金中的局部力矩;近藤效应;化合价涨落;重费米子;

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