Observation of a Highly Spin Polarized Topological Surface State in   GeBi$_{2}$Te$_{4}$
  Spin polarization of a topological surface state for GeBi$_2$Te$_4$, the newly discovered three-dimensional topological insulator, has been studied by means of the state of the art spin- and angle-resolved photoemission spectroscopy. It has been revealed that the disorder in the crystal has a minor effect on the surface state spin polarization and it exceeds 75% near the Dirac point in the bulk energy gap region ($\sim$180 meV). This new finding for GeBi$_{2}$Te$_{4}$ promises not only to realize a highly spin polarized surface isolated transport but to add new functionality to its thermoelectric and thermomagnetic properties. 
K. Okamoto, K. Kuroda, H. Miyahara, K. Miyamoto, T. Okuda, Z. S.   Aliev, M. B. Babanly, I. R. Amiraslanov, K. Shimada, H. N...
cond-mat.mes-hall