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000888463 1001_ $$0P:(DE-HGF)0$$aChen, Guan-Yu$$b0
000888463 245__ $$aOrbital-enhanced warping effect in px,py-derived Rashba spin splitting of monatomic bismuth surface alloy
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000888463 520__ $$aSpin-split Rashba bands have been exploited to efficiently control the spin degree of freedom of moving electrons, which possesses a great potential in frontier applications of designing spintronic devices and processing spin-based information. Given an intrinsic breaking of inversion symmetry and sizeable spin–orbit interaction, two-dimensional (2D) surface alloys formed by heavy metal elements exhibit a pronounced Rashba-type spin splitting of the surface states. Here, we have revealed the essential role of atomic orbital symmetry in the hexagonally warped Rashba spin-split surface state of the 3–√×3–√R300 BiCu2 monatomic alloy by scanning tunneling spectroscopy (STS) and density functional theory (DFT). From dI/dU spectra and calculated band structures, three hole-like Rashba-split bands hybridized from distinct orbital symmetries have been identified in the unoccupied energy region. Because of the hexagonally deformed Fermi surface, quasi-particle interference (QPI) mappings have resolved scattering channels opened from interband transitions of px,py (mj = 1/2) band. In contrast to the s,pz-derived band, the hexagonal warping is predominately accompanied by substantial out-of-plane spin polarization Sz up to 24% in the dispersion of px,py (mj = 1/2) band with an in-plane orbital symmetry.
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000888463 7001_ $$00000-0002-0800-3172$$aHuang, Angus$$b1
000888463 7001_ $$0P:(DE-HGF)0$$aLin, Yen-Hui$$b2
000888463 7001_ $$0P:(DE-HGF)0$$aChen, Chia-Ju$$b3
000888463 7001_ $$0P:(DE-HGF)0$$aLin, Deng-Sung$$b4
000888463 7001_ $$0P:(DE-HGF)0$$aChang, Po-Yao$$b5
000888463 7001_ $$00000-0002-2881-3826$$aJeng, Horng-Tay$$b6$$eCorresponding author
000888463 7001_ $$0P:(DE-Juel1)130545$$aBihlmayer, Gustav$$b7
000888463 7001_ $$00000-0002-5704-6574$$aHsu, Pin-Jui$$b8$$eCorresponding author
000888463 773__ $$0PERI:(DE-600)2882263-8$$a10.1038/s41535-020-00293-3$$gVol. 5, no. 1, p. 89$$n1$$p89$$tnpj quantum materials$$v5$$x2397-4648$$y2020
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