Home > Publications database > Orbital-enhanced warping effect in px,py-derived Rashba spin splitting of monatomic bismuth surface alloy > print

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100 1 _ |a Chen, Guan-Yu
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245 _ _ |a Orbital-enhanced warping effect in px,py-derived Rashba spin splitting of monatomic bismuth surface alloy
260 _ _ |a [London]
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520 _ _ |a Spin-split Rashba bands have been exploited to efficiently control the spin degree of freedom of moving electrons, which possesses a great potential in frontier applications of designing spintronic devices and processing spin-based information. Given an intrinsic breaking of inversion symmetry and sizeable spin–orbit interaction, two-dimensional (2D) surface alloys formed by heavy metal elements exhibit a pronounced Rashba-type spin splitting of the surface states. Here, we have revealed the essential role of atomic orbital symmetry in the hexagonally warped Rashba spin-split surface state of the 3–√×3–√R300 BiCu2 monatomic alloy by scanning tunneling spectroscopy (STS) and density functional theory (DFT). From dI/dU spectra and calculated band structures, three hole-like Rashba-split bands hybridized from distinct orbital symmetries have been identified in the unoccupied energy region. Because of the hexagonally deformed Fermi surface, quasi-particle interference (QPI) mappings have resolved scattering channels opened from interband transitions of px,py (mj = 1/2) band. In contrast to the s,pz-derived band, the hexagonal warping is predominately accompanied by substantial out-of-plane spin polarization Sz up to 24% in the dispersion of px,py (mj = 1/2) band with an in-plane orbital symmetry.
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700 1 _ |a Huang, Angus
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700 1 _ |a Lin, Yen-Hui
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700 1 _ |a Chen, Chia-Ju
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700 1 _ |a Lin, Deng-Sung
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700 1 _ |a Chang, Po-Yao
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700 1 _ |a Jeng, Horng-Tay
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700 1 _ |a Bihlmayer, Gustav
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700 1 _ |a Hsu, Pin-Jui
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773 _ _ |a 10.1038/s41535-020-00293-3
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