基于对称性选择规则的稳定单原子和多原子纳米磁体的一般方案
General scheme for stable single and multiatom nanomagnets according to symmetry selection rules
摘要：
在低温下，信息可以存储在吸附原子的局部磁矩的方向。然而，电子和声子与纳米磁体的散射导致其状态具有不相干的经典动力学，并可能导致编码信息的快速丢失。最近，人们已经理解，这种散射服从某些选择规则，由于系统的对称性。通过分析表面的点群对称性，时间反演对称性和吸附原子有效自旋的大小，我们确定哪些纳米磁体配置是要避免的，哪些是有希望编码一个稳定的位。引入并开发了一种新的研究工具：准自旋量子数。通过这个工具，我们的结果很容易推广到一个广泛的类的二分团簇配置吸附原子耦合通过海森堡的相互作用。最后，为了与实验联系，进行了数值模拟，以显示这种稳定的配置如何响应典型的扫描隧道显微镜测量。
英文摘要：
At low temperature, information can be stored in the orientation of the localized magnetic moment of an adatom. However, scattering of electrons and phonons with the nanomagnet leads its state to have incoherent classical dynamics and might cause fast loss of the encoded information. Recently, it has been understood that such scattering obeys certain selection rules due to the symmetries of the system. By analyzing the point-group symmetry of the surface, the time-reversal symmetry and the magnitude of the adatom effective spin, we identify which nanomagnets configurations are to be avoided and which are promising to encode a stable bit. A new tool of investigation is introduced and exploited: the quasi-spin quantum number. By means of this tool, our results are easily generalized to a broad class of bipartite cluster configurations where adatoms are coupled through Heisenberg-like interactions. Finally, to make contact with the experiments, numerical simulations have been performed to show how such stable configurations respond to typical scanning tunneling microscopy measurements.
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