Tunability of the k-space location of the Dirac cones in the topological crystalline insulator Pb1-xSnxTe
Tunability of the k-space location of the Dirac cones in the topological crystalline insulator Pb1-xSnxTe
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DOI：
10.1103/physrevb.87.155105
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发表时间：
2013-04-02
影响因子：
3.7
通讯作者：
Ando, Yoichi
中科院分区：
文献类型：
--
作者：
Tanaka, Y.;Sato, T.;Ando, Yoichi
我们用系统的角度分辨光电子能谱对拓扑晶体绝缘体(TCI)Pb1-xSnxTe进行了研究，以阐明其电子态在拓扑相变过程中的演化。如先前报道的，在(001)面上测量的SNTE(x=1.0)的能带结构具有一对狄拉克-锥面面态，它们对称地横跨(X)位于(110)镜面的棒点上。在x(C)接近0.25时，我们发现Dirac锥逐渐向(X)上方的杆点移动，其谱权重随x的减小而逐渐减小。
We have performed systematic angle-resolved photoemission spectroscopy of the topological crystalline insulator (TCI) Pb1-xSnxTe to elucidate the evolution of its electronic states across the topological phase transition. As previously reported, the band structure of SnTe (x = 1.0) measured on the (001) surface possesses a pair of Dirac-cone surface states located symmetrically across the (X) over bar point in the (110) mirror plane. Upon approaching the topological phase transition into the trivial phase at x(c) approximate to 0.25, we discovered that Dirac cones gradually move toward the (X) over bar point with its spectral weight gradually reduced with decreasing x. In samples with x