Pt原子链的散粒噪声和磁性：边界点的积累
Shot noise and magnetism of Pt atomic chains: accumulation of points at the boundary
摘要：
已知Pt在断开金属接触时显示出单原子链的自发形成。根据模型计算，这些链预计是自旋极化的。然而，支持或反对磁性的直接实验证据是缺乏的。在这里，我们调查散粒噪声作为一个潜在的信息来源的Pt原子链的磁状态。我们观察到一个显着的结构，在测量的散粒噪声水平的分布，其中的数据似乎被限制在该地区的非线性状态。虽然这表明Pt原子链的磁性基态，但从计算中我们发现Pt链中的磁性是由于“演员”电子通道，其对弹道电导和噪声的贡献很小。另一方面，存在弱极化的“旁观者”通道，其承载大部分电流并且仅被磁状态略微修改。
英文摘要：
Pt is known to show spontaneous formation of monatomic chains upon breaking a metallic contact. From model calculations, these chains are expected to be spin polarized. However, direct experimental evidence for or against magnetism is lacking. Here, we investigate shot noise as a potential source of information on the magnetic state of Pt atomic chains. We observe a remarkable structure in the distribution of measured shot-noise levels, where the data appear to be confined to the region of nonmagnetic states. While this suggests a nonmagnetic ground state for the Pt atomic chains, from calculations we find that the magnetism in Pt chains is due to 'actor' electron channels, which contribute very little to ballistic conductance and noise. On the other hand, there are weakly polarized 'spectator' channels, which carry most of the current and are only slightly modified by the magnetic state.
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