Spin-polarized surface bands of a three-dimensional topological insulator studied by high-resolution spin- and angle-resolved photoemission spectroscopy

Details Spin-polarized surface bands of a three-dimensional topological insulator studied by high-resolution spin- and angle-resolved photoemission spectroscopy Spin-polarized surface bands of a three-dimensional topological insulator studied by high-resolution spin- and angle-resolved photoemission spectroscopy

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12f5011n&link_type=abstract

New Journal of Physics, Volume 12, Issue 6, pp. 065011 (2010).

Physics

3

Scientific paper

The spin-polarized surface band structure of the three-dimensional (3D) quantum spin Hall phase of Bi1-xSbx (x=0.12-0.13) was studied by spin- and angle-resolved photoemission spectroscopy (SARPES) using a high-yield spin polarimeter equipped with a high-resolution electron spectrometer. The spin-integrated spectra were also measured and compared to those of Bi1-xSbx with x=0.04. Band dispersions of the edge states were fully elucidated between the two time-reversal-invariant points, \skew3\bar{\Gamma} and \skew3\bar{M} , of the (111) surface Brillouin zone. The observed spin-polarized band dispersions at x=0.12-0.13 indicate an odd number of the band crossing at the Fermi energy, giving unambiguous evidence that this system is a 3D strong topological insulator, and determine the 'mirror chirality' to be -1, which excludes the existence of a Dirac point in the middle of the \skew3\bar{\Gamma} -\skew3\bar{M} line. The present research demonstrates that the SARPES measurement with energy resolution <=50 meV is one of the critical techniques for complementing the topological band theory for spins and spin currents.

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