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Giant spin-orbit-induced spin splitting in Bi zigzag chains on GaAs(110)

Title
Giant spin-orbit-induced spin splitting in Bi zigzag chains on GaAs(110)
Author
조준형
Keywords
INVERSE-PHOTOEMISSION; SURFACE-STATES; INTERFACE; BI/GAAS(110); SPECTROSCOPY; METALS
Issue Date
2015-08
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 92, NO 8, Page. 85303-85308
Abstract
The search for one-dimensional electron systems with a giant Rashba-type spin splitting is of importance for the application of spin transport. Here we report, based on a first-principles density-functional-theory calculation, that Bi zigzag chains formed on a heterogeneous GaAs(110) surface have a giant spin splitting of surface states. This giant spin splitting is revealed to originate from spin-orbit coupling (SOC) and electric dipole interaction that are significantly enhanced by (i) the asymmetric surface charge distribution due to the strong SOC-induced hybridization of the Bi p(x), p(y), and p(z) orbitals and (ii) the large out-of-plane and in-plane potential gradients generated by two geometrically and electronically inequivalent Bi atoms bonding to Ga and As atoms. The results demonstrate an important implication of the in-plane and out-of-plane asymmetry of the Bi/GaAs(110) interface system in producing the giant spin splitting with the in-plane and out-of-plane spin components.
URI
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.085303http://hdl.handle.net/20.500.11754/26934
ISSN
1098-0121; 1550-235X
DOI
10.1103/PhysRevB.92.085303
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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