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[摘要]：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. |
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