Kondo effect in coupled quantum dots with RKKY interaction: Effects of finite temperature and magnetic field

Chung-Hou Chung; Walter Hofstetter

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Kondo effect in coupled quantum dots with RKKY interaction: Effects of finite temperature and magnetic field

机译：具有RKKY相互作用的耦合量子点中的近藤效应：有限温度和磁场的影响

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We study transport through two quantum dots coupled by a Ruderman-Kittel-Kasuya-Yoshida interaction as a function of temperature and magnetic field. By applying the numerical renormalization group method, we obtain the transmission and the linear conductance. At zero temperature and magnetic field, we observe a quantum phase transition between the Kondo screened state and a local spin singlet as the RKKY interaction is tuned. Above the critical RKKY coupling, the Kondo peak is split. However, we find that both finite temperature and magnetic field restore the Kondo resonance. Our results agree well with recent transport experiments on gold grain quantum dots in the presence of magnetic impurities [H. B. Heersche et al., Phys. Rev. Lett. 96, 017205 (2006)].

机译：我们研究通过两个量子点的传输，该量子点由Ruderman-Kittel-Kasuya-Yoshida相互作用耦合为温度和磁场的函数。通过应用数值归一化群方法，我们可以获得透射率和线性电导。在零温度和磁场下，当调节RKKY相互作用时，我们观察到Kondo屏蔽态和局部自旋单重态之间的量子相变。在关键的RKKY耦合之上，近藤峰分裂。但是，我们发现有限的温度和磁场都会恢复近藤共振。我们的结果与最近在磁性杂质[H. B.Heersche等，物理学。牧师96，017205（2006）]。

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来源
《Physical review》 |2007年第4期|045329.1-045329.6|共6页
作者
Chung-Hou Chung; Walter Hofstetter;
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作者单位

Institut fuer Theorie der Kondensierten Materie, Universitaet Karlsruhe, 76128 Karlsruhe, Germany;

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原文格式 PDF
正文语种 eng
中图分类固体物理学;
关键词
coulomb blockade; single-electron tunneling; quantum dots; magnetic impurity interactions; strongly correlated electron systems; heavy fermions;

机译：库仑封锁;单电子隧穿量子点;磁性杂质相互作用;强相关电子系统;重费米子;

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1. Transport Spectroscopy of Kondo Quantum Dots Coupled by RKKY Interaction [J] . Maxim G. Vavilov, Leonid I. Glazman Physical review letters . 2005,第8期

机译：与RKKY相互作用耦合的近藤量子点的传输光谱
2. Ruderman-Kittel-Kasuya-Yosida and Magnetic-Field Interactions in Coupled Kondo Quantum Dots [J] . Pascal Simon, Rosa Lopez, Yuval Oreg Physical review letters . 2005,第8期

机译：Ruderman-Kittel-Kasuya-Yosida和近场耦合量子点中的磁场相互作用
3. Fano-Kondo effect in side-coupled double quantum dots at finite temperatures and the importance of two-stage Kondo screening [J] . Rok Zitko Physical review . 2010,第11期

机译：有限温度下侧耦合双量子点的Fano-Kondo效应以及两步Kondo筛选的重要性
4. RKKY Interaction in a Chirally Coupled Double Quantum Dot System [C] . A. W. Heine, D. Tutuc, G. Zwicknagl, ICPS 2012 . 2013

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5. Transport in Weakly Coupled Vertical Double Quantum Dots: Single-Particle Energy Level Spectroscopy and Hyperfine Interaction Effects. [D] . Payette, Christopher. 2011

机译：弱耦合垂直双量子点中的传输：单粒子能级光谱和超精细相互作用效应。
6. Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field [O] . Levente Máthé, Ioan Grosu 2020

机译：磁场作用下石墨烯偶联量子点的非平衡近藤效应
7. Kondo effect in coupled quantum dots with RKKY interaction: Finite temperature and magnetic field effects [O] . Chung, Chung-Hou, Hofstetter, Walter 2006

机译：具有RKKY相互作用的耦合量子点中的近藤效应：有限温度和磁场效应

Kondo effect in coupled quantum dots with RKKY interaction: Effects of finite temperature and magnetic field

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