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首页> 外文期刊>Physical review >Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity
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Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity

机译：铁磁纳米线/超导体异质结构的微观理论：传输，涨落和拓扑超导

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摘要

Motivated by the recent experiment of Wang et al. [Nat. Phys. 6, 389 (2010)], who observed a highly unusual transport behavior of ferromagnetic cobalt nanowires proximity-coupled to superconducting electrodes, we study the proximity effect and temperature-dependent transport in such a mesoscopic hybrid structure. It is assumed that the asymmetry in the tunneling barrier gives rise to the Rashba spin-orbit coupling in the barrier that enables induced p-wave superconductivity in the ferromagnet to exist. We first develop a microscopic theory of Andreev scattering at the spin-orbit-coupled interface, derive a set of self-consistent boundary conditions, and find an expression for the p-wave minigap in terms of the microscopic parameters of the contact. Second, we study the temperature dependence of the resistance near the superconducting transition, and we find that it should generally feature a fluctuation-induced peak. The upturn in resistance is related to the suppression of the single-particle density of states due to the formation of fluctuating pairs, whose tunneling is suppressed. In conclusion, we discuss this and related setups involving ferromagnetic nanowires in the context of one-dimensional topological superconductors. It is argued that to realize unpaired end Majorana modes, one does not necessarily need a half-metallic state; a partial spin polarization may suffice. Finally, we propose yet another related class of material systems-ferromagnetic semiconductor wires coupled to ferromagnetic superconductors-where direct realization of the Kitaev-Majorana model should be especially straightforward.
机译：受到王等人最近实验的启发。 [Nat。物理6，389（2010）]，他观察到铁磁钴纳米线接近耦合到超导电极的极不寻常的传输行为，我们研究了这种介观混合结构中的接近效应和温度依赖性传输。假定隧道势垒中的不对称会引起势垒中的Rashba自旋轨道耦合，从而使铁磁体中存在感应的p波超导。我们首先发展了自旋-轨道耦合界面处安德列夫散射的微观理论，导出了一组自洽边界条件，并根据接触的微观参数找到了p波最小能隙的表达式。其次，我们研究了超导转变附近电阻的温度依赖性，并且发现它通常应具有波动引起的峰值。电阻的上升与由于波动对的形成而抑制状态的单粒子密度有关，波动对的形成被抑制。总之，我们在一维拓扑超导体的背景下讨论了涉及铁磁纳米线的此设置和相关设置。有人认为，要实现不成对的马洛拉那峰终模，并不一定需要半金属态。部分自旋极化就足够了。最后，我们提出了另一类相关的材料系统-耦合到铁磁超导体的铁磁半导体线-Kitaev-Majorana模型的直接实现应该特别简单。

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  • 来源
    《Physical review》 |2012年第5期|p.054521.1-054521.14|共14页
  • 作者

    So Takei; Victor Galitski;

  • 作者单位

    Condensed Matter Theory Center, The Department of Physics, The University of Maryland, College Park, Maryland 20742-4111, USA;

    Condensed Matter Theory Center, The Department of Physics, The University of Maryland, College Park, Maryland 20742-4111, USA,Joint Quantum Institute, The University of Maryland, College Park, Maryland 20742-4111, USA,Kavli Institute for Theoretical Physics, University of California at Santa Barbara, Santa Barbara, California 93106-4030, USA;

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  • 正文语种 eng
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  • 关键词

    electronic transport in interface structures;

    机译：接口结构中的电子传输;

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