期刊
PHYSICAL REVIEW B
卷 80, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.245323
关键词
Anderson model; quantum dots; quantum entanglement; tunnelling
资金
- CREST of Japan Science and Technology Agency [20740217, 17340115]
- Grants-in-Aid for Scientific Research [17340115, 20740217] Funding Source: KAKEN
We analytically study entanglement generation through an open quantum-dot system described by the two-lead Anderson model. We exactly obtain the transition rate between the nonentangled incident state in one lead and the outgoing spin-singlet state in the other lead. We find that only the spin-singlet state can transmit in the cotunneling process. To discuss such an entanglement property in the open quantum system, we construct the exact two-electron scattering state of the Anderson model. It is striking that the scattering state contains spin-singlet bound states induced by the Coulomb interaction. The bound state describes a scattering process in which the set of momenta is not conserved and hence, it is not in the form of a Bethe eigenstate.
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