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There are 42 papers published in subject: > since this site started. |
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1. Antiresonance in multi-quantum-dot system and its application as a spin filter | |||
Weijiang Gong,Yisong Zheng,Yu Liu,Wenzhu Gao | |||
Physics 28 August 2006 | |||
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Abstract:By means of the nonequilibrium Green function technique, the electronic transport through a multi-quantum-dot system is theoretically studied. In this system, a one-dimensional quantum dot chain between two contacts forms a main channel for the electronic tunnelling. Each quantum dot in the chain couples laterally to a dangling quantum dot. Whenever the energy of the incident electron is aligned with the energy levels of the dangling quantum dots, a zero point of the electron transmission function occurs due to the Fano antiresonance. As a result, the linear conductance spectrum presents an insulating band around the antiresonant point. What is interesting is that both edges of the insulating band become steep rapidly with the increase of numbers of the quantum dots, and an energy gap comes up evidently. This phenomenon is discussed in detail, and is compared with the one-dimensional double quantum dot system, where one can realize the importance of the antiresonant effect. Therefore, we assume that the quantum dot levels are spin dependent, which can be realized by applying a magnetic field on them or assuming them to be made of ferromagnetic material. The energy gap corresponding to opposite spins can separate from each other. With regard to the intradot electron interaction, we assume the second-order approximation, and the energy gap broadens. On the basis of this feature, we propose that such a double-quantum-dot chain can be considered as a device prototype of a spin flter. | |||
TO cite this article:Weijiang Gong,Yisong Zheng,Yu Liu, et al. Antiresonance in multi-quantum-dot system and its application as a spin filter[OL].[28 August 2006] http://en.paper.edu.cn/en_releasepaper/content/8042 |
2. Entanglement in a Quantum Mixed-Spin | |||
Hao Xiang,Zhu Shiqun | |||
Physics 21 April 2006 | |||
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Abstract:The entanglement in a general mixed spin chain with arbitrary spin $S$ and $1/2$ is investigated in the thermodynamical limit. The entanglement is witnessed by the magnetic susceptibility which decides a characteristic temperature for an entangled thermal state. The characteristic temperature is nearly proportional to the interaction $J$ and the mixed spin $S$. The bound of negativity is obtained on the basis of the magnetic susceptibility. It is found that the macroscopic magnetic properties are affected by the quantum entanglement in the real solids. Meanwhile, the entanglement can be quantitatively evaluated by the thermodynamical observable. | |||
TO cite this article:Hao Xiang,Zhu Shiqun. Entanglement in a Quantum Mixed-Spin[OL].[21 April 2006] http://en.paper.edu.cn/en_releasepaper/content/6339 |
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