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DC Self-Field Critical Current in Superconductor/ Dirac-Cone Material/Superconductor Junctions

机译:超导体/狄拉克锥材料/超导体结中的直流自电场临界电流

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摘要

Recently, several research groups have reported on anomalous enhancement of the self-field critical currents, (sf, ), at low temperatures in superconductor/Dirac-cone material/superconductor (S/DCM/S) junctions. Some papers attributed the enhancement to the low-energy Andreev bound states arising from winding of the electronic wave function around DCM. In this paper, (sf, ) in S/DCM/S junctions have been analyzed by two approaches: modified Ambegaokar-Baratoff and ballistic Titov-Beenakker models. It is shown that the ballistic model, which is traditionally considered to be a basic model to describe (sf, ) in S/DCM/S junctions, is an inadequate tool to analyze experimental data from these type of junctions, while Ambegaokar-Baratoff model, which is generally considered to be a model for (sf, ) in superconductor/insulator/superconductor junctions, provides good experimental data description. Thus, there is a need to develop a new model for self-field critical currents in S/DCM/S systems.
机译:最近,一些研究小组报告了超导体/狄拉克锥材料/超导体(S / DCM / S)结中低温下自场临界电流(sf,)的异常增强。一些论文将增强归因于围绕DCM的电子波函数缠绕引起的低能Andreev束缚态。在本文中,通过两种方法分析了S / DCM / S交界处的(sf,):改进的Ambegaokar-Baratoff模型和弹道Titov-Beenakker模型。结果表明,传统上被认为是描述S / DCM / S交界处(sf,)的基本模型的弹道模型,不足以分析这些交界处的实验数据,而Ambegaokar-Baratoff模型通常被认为是超导体/绝缘子/超导体结中的(sf,)的模型,它提供了良好的实验数据描述。因此,需要为S / DCM / S系统中的自场临界电流开发新的模型。

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