Quantum Interference of Rashba-Type Spin-Split Surface State Electrons
Quantum Interference of Rashba-Type Spin-Split Surface State Electrons
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DOI：
10.1103/physrevlett.107.027204
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发表时间：
2011-07-07
影响因子：
8.6
通讯作者：
Kato, Chiaki
中科院分区：
文献类型：
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作者：
Hirayama, Hiroyuki;Aoki, Yuki;Kato, Chiaki
我们研究了 Si(111) 衬底上 10 个单层厚 Ag(111) 薄膜的 Bi/Ag(111)root 3 x root 3 表面上 Bi (p(x,) p(y)) 轨道衍生的 j = 1/2 自旋分裂表面态中电子的量子干涉。在两个自旋分裂向下色散抛物线带 (Ex) 交点下方的能量 (E) 处可以清楚地观察到表面电子驻波。驻波图的 E 依赖性揭示了由于垂直条（k + Delta）、向上箭头 > 和垂直条 - (k - Delta)、向上箭头 > [或（垂直条（k - Delta)、向下箭头 >）和垂直条 - (k + Delta)、向下箭头 >] 状态之间的干扰，色散为两个自旋分裂表面带的平均值。相反，不可能从 E >= E(x) 处的驻波图案推断出色散，因为表面电子无法找到具有相同自旋极化的反向散射态。
We studied the quantum interference of electrons in the Bi (p(x,) p(y)) orbital-derived j = 1/2 spin-split surface states at Bi/Ag(111)root 3 x root 3 surfaces of 10 monolayer thick Ag(111) films on Si(111) substrates. Surface electron standing waves were observed clearly at the energy (E) below the intersection of the two spin-split downward dispersing parabola bands (Ex). The E dependence of the standing wave pattern reveals the dispersion as the average of the two spin-split surface bands due to the interference between vertical bar(k + Delta), up arrow > and vertical bar - (k - Delta), up arrow > [or (vertical bar(k - Delta), down arrow >) and vertical bar - (k + Delta), down arrow >] states. In contrast, it was impossible to deduce the dispersion from the standing wave pattern at E >= E(x) because the surface electron cannot find its backscattered state with the same spin polarization.