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首页> 外文期刊>Physical review >Spin-polarized (001) surface states of the topological crystalline insulator Pb0_(0.73)Sn_(0.27)Se
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Spin-polarized (001) surface states of the topological crystalline insulator Pb0_(0.73)Sn_(0.27)Se

机译:拓扑晶体绝缘体Pb0_(0.73)Sn_(0.27)Se的自旋极化(001)表面态

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摘要

We study the nature of (001) surface states in Pb_(0.73)Sn_(0.27)Se in the newly discovered topological-crystalline-insulator (TCI) phase as well as the corresponding topologically trivial state above the band-gap-inversion temperature. Our calculations predict not only metallic surface states with a nontrivial chiral spin structure for the TCI case, but also nonmetallic (gapped) surface states with nonzero spin polarization when the system is a normal insulator. For both phases, angle- and spin-resolved photoelectron spectroscopy measurements provide conclusive evidence for the formation of these (001) surface states in Pb_(0.73)Sn_(0.27)Se, as well as for their chiral spin structure.
机译:我们研究了新发现的拓扑晶体绝缘体(TCI)相中Pb_(0.73)Sn_(0.27)Se中(001)表面状态的性质以及带隙反转温度以上的相应拓扑琐碎状态。我们的计算不仅预测了在TCI情况下具有非平凡手性自旋结构的金属表面状态,而且还预测了当系统为正常绝缘体时具有非零自旋极化的非金属(带隙)表面状态。对于这两个阶段,角度和自旋分辨光电子能谱测量都为在Pb_(0.73)Sn_(0.27)Se中形成这些(001)表面态及其手性自旋结构提供了确凿的证据。

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