Kondo regimes in a three-dots quantum gate

G. Chiappe; E. V. Anda; L. Costa Ribeiro; E. Louis

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Kondo regimes in a three-dots quantum gate

机译：三点量子门中的近藤政权

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The transport properties of a linear structure of three quantum dots, with the central one connected to leads, are studied using the logarithmic discretization embedded cluster approximation. It is shown that the side dot spins can be ferromagnetically (F) or antiferromagnetically (AF) correlated between them, depending on the charge at the central dot. The system possesses a regime of coexistence of a two stage Kondo effect and the F phase. Ferromagnetism destroys the Kondo ground state when the system is driven to Ihe molecular regime by increasing the interdot interaction above the largest Kondo temperature. Instead, an AF ground state does not compete with the Kondo regime. This remarkable behavior indicates that the measurement of the conductance can be an efficient readout procedure when the system operates as a quantum gate.

机译：使用对数离散化嵌入簇近似，研究了三个量子点（中心点连接到引线）的线性结构的传输性质。结果表明，根据中心点的电荷，侧点自旋可以在铁磁（F）或反铁磁（AF）之间建立关联。该系统具有两阶段近藤效应和F相共存的状态。当系统被驱动到分子态时，铁磁性会通过将点间相互作用增加到最大近藤温度以上来破坏近藤基态。相反，AF的基态不会与近藤政权竞争。这种显着的行为表明，当系统用作量子门时，电导的测量可以是一种有效的读出程序。

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来源
《Physical review》 |2010年第4期|041310.1-041310.4|共4页
作者
G. Chiappe; E. V. Anda; L. Costa Ribeiro; E. Louis;
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作者单位

Departmento de Fisica Aplicada, Unidad Asociada del Consejo Superior de Investigaciones Cientificas and lnstituto Universitario de Materiales, Universidad de Alicante, San Vicente del Raspeig, Alicante 03690, Spain;

rnDepartamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro (PUC-Rio), Caixa Postal 38071,Rio de Janeiro 22452-970, RJ, Brazil;

rnDepartamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro (PUC-Rio), Caixa Postal 38071,Rio de Janeiro 22452-970, RJ, Brazil;

rnDepartmento de Fisica Aplicada, Unidad Asociada del Consejo Superior de Investigaciones Cientificas and lnstituto Universitario de Materiales, Universidad de Alicante, San Vicente del Raspeig, Alicante 03690, Spain;

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nanotubes; density functional theory, local density approximation, gradient and other corrections;

机译：纳米管密度泛函理论;局部密度近似;梯度和其他校正;

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3. Transport across two interacting quantum dots: Bulk Kondo, Kondo box, and molecular regimes [J] . L. C. Ribeiro, I. J. Hamad, G. Chiappe, Physical review . 2014,第4期

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Kondo regimes in a three-dots quantum gate

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