Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.066801
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Funding
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Defense Advanced Research Projects Agency Microsystems Technology Office
- MesoDynamic Architecture Program (MESO) [N66001-11-1-4105]
- DARPA Program on Topological Insulators-Solid State Chemistry, New Materials and Properties [N66001-12-1-4034]
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For three-dimensional topological insulators in the Bi2Se3 family, topological surface states with p(z) orbitals have a left-handed spin texture for the upper Dirac cone and a right-handed spin texture for the lower Dirac cone. In this work, we predict a new form of the spin-orbital texture associated with the p(x) and p(y) orbitals. For the upper Dirac cone, a left-handed (right-handed) spin texture is coupled to the radial (tangential) orbital texture, whereas for the lower Dirac cone, the coupling of spin and orbital textures is the exact opposite. The tangential (radial) orbital texture is dominant for the upper (lower) Dirac cone, leading to the right-handed spin texture for the in-plane orbitals of both the upper and lower Dirac cones. A spin-resolved and photon polarized angle-resolved photoemission spectroscopy experiment is proposed to observe this novel spin-orbital texture.
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