Guodong Liu

TL;DR: In this paper, high-resolution angle-resolved photo-emission spectroscopy measurements and band structure calculations were carried out to study the electronic structure of a hole-like Fermi surface.

TL;DR: In this paper, the exact determination of the Planck constant by modern photo-emission spectroscopy technique has been presented by using the direct use of the Einstein's photoelectric equation and using the energy position of the gold Fermi level with various photon wavelengths.

TL;DR: In this article, a systematic evolution of the electronic structure and superstructure with Pb substitution has been revealed for the first time, showing that the superstructure shows a significant change with pb substitution and the incommensurate modulation vector decreases with increasing Pb substitutions.

TL;DR: In this article , the authors reported the perfect combination of half-metallicity and electronic topological properties in single 2D phase, namely, the PrOBr monolayer, which only possesses conducting electrons in the spin-up channel, while it shows a large insulating gap of 3.5 eV in the Spindown channel with the Curie temperature as high as 423 K.

Abstract: Topological insulators represent a new quantum state of matter that are insulating in the bulk but metallic on the edge or surface. In the Dirac surface state, it is well-established that the electron spin is locked with the crystal momentum. Here we report a new phenomenon of the spin texture locking with the orbital texture in a topological insulator Bi₂Se₃. We observe light-polarization-dependent spin texture of both the upper and lower Dirac cones that constitutes strong evidence of the orbital-dependent spin texture in Bi₂Se₃. The different spin texture detected in variable polarization geometry is the manifestation of the spin-orbital texture in the initial state combined with the photoemission matrix element effects. Our observations provide a new orbital degree of freedom and a new way of light manipulation in controlling the spin structure of the topological insulators that are important for their future applications in spin-related technologies.