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arXiv 1002.4912cond-mat.mes-hallcond-mat.supr-con
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d-f杂化对Eu硫族化合物约瑟夫森电流的影响

Effect of d-f hybridization on the Josephson current through Eu-chalcogenides

Shiro Kawabata, Yasuhiro Asano, Yukio Tanaka, Satoshi Kashiwaya

摘要:

由超导体/铁磁金属/超导体(S-FM-S)制成的具有π结的超导环在没有外部磁场的情况下在基态表现出自发电流。这样的π环提供了所谓的安静量子比特,其可以有效地与外部场的波动解耦。然而,FM的使用引起强欧姆耗散。因此,实现没有FM的π结对于量子比特应用是期望的。我们从理论上考虑了基于d-f哈密顿量的S/Eu硫族化物/S结π耦合的可能性。利用格林函数方法,我们发现在导电d和定域f电子之间有限d-f杂化的情况下,可以形成π结。

英文摘要:

A superconducting ring with a pi junction made from superconductor/ferromagnetic-metal/superconductor (S-FM-S) exhibits a spontaneous current without an external magnetic field in the ground state. Such pi ring provides so-called quiet qubit that can be efficiently decoupled from the fluctuation of the external field. However, the usage of the FM gives rise to strong Ohmic dissipation. Therefore, the realization of pi junctions without FM is expected for qubit applications. We theoretically consider the possibility of the pi coupling for S/Eu-chalcogenides/S junctions based on the d-f Hamiltonian. By use of the Green's function method we found that pi junction can be formed in the case of the finite d-f hybridization between the conduction d and the localized f electrons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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