Coherent long-range magnetic bound states in a superconductor
Coherent long-range magnetic bound states in a superconductor
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DOI：
10.1038/nphys3508
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发表时间：
2015-12-01
期刊：
影响因子：
19.6
通讯作者：
Cren, Tristan
中科院分区：
文献类型：
--
作者：
Menard, Gerbold C.;Guissart, Sebastien;Cren, Tristan
完全不同自由度的量子耦合是实现量子电子学新功能的一条具有挑战性的道路（1-3）。在这里，我们表明，局域经典自旋的磁性原子沉浸在一个超导体的二维电子带结构引起的长程相干磁量子态。我们的实验证据相干束缚态与空间振荡粒子-空穴不对称性延伸几十纳米从单个铁原子嵌入在2 H-NbSe 2晶体。我们从理论上阐明如何减少维数提高这些束缚态的空间范围，并描述他们的能量和空间结构。这些空间扩展的磁态可以用作在新的拓扑超导相中相干耦合远距离磁原子的构建块（4-11）。
The quantum coupling of fully different degrees of freedom is a challenging path towards new functionalities for quantum electronics(1-3). Here we show that the localized classical spin of a magnetic atom immersed in a superconductor with a two-dimensional electronic band structure gives rise to a long-range coherent magnetic quantum state. We experimentally evidence coherent bound states with spatially oscillating particle-hole asymmetry extending tens of nanometres from individual iron atoms embedded in a 2H-NbSe2 crystal. We theoretically elucidate how reduced dimensionality enhances the spatial extent of these bound states and describe their energy and spatial structure. These spatially extended magnetic states could be used as building blocks for coupling coherently distant magnetic atoms in new topological superconducting phases(4-11).