用Andreev边态确定钠钴氧化物的对对称性
Identifying the pairing symmetry in sodium cobalt oxide by Andreev edge states
摘要：
研究了半无限三角晶格Na_xCoO_2·yH_2O上具有不同对称性和边界拓扑的Andreev边态.发展了从二维晶格到一维紧束缚模型的一般映射。结果表明，Andreev边缘态的相图依赖于对对称性和边界拓扑结构。令人惊讶的是，相图的结构主要依赖于费米表面上的节点，并且可以用一个优雅的规范参数来解释。我们计算了动量分辨的局域态密度，并预测了在傅里叶变换扫描隧道光谱中可测量的热点。
英文摘要：
We study the Andreev edge states with different pairing symmetries and boundary topologies on semi-infinite triangular lattice of Na_xCoO_2.yH_2O. A general mapping from the two dimensional lattice to the one dimensional tight-binding model is developed. It is shown that the phase diagram of the Andreev edge states depends on the pairing symmetry and also the boundary topology. Surprisingly, the structure of the phase diagram crucially relies on the nodal points on the Fermi surface and can be explained by an elegant gauge argument. We compute the momentum-resolved local density of states near the edge and predict the hot spots which are measurable in Fourier-transformed scanning tunneling spectroscopy.
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