Oscillatory surface dichroism of an insulating topological insulator Bi2Te2Se

M. Neupane; S. Basak; N. Alidoust; S. -Y. Xu; Chang Liu; I. Belopolski; G. Bian; J. Xiong; H. Ji; S. Jia; S. -K. Mo; M. Bissen; M. Severson; H. Lin; N. P. Ong; T. Durakiewicz; R. J. Cava; A. Bansil; M. Z. Hasan

doi:10.1103/PhysRevB.88.165129

Oscillatory surface dichroism of an insulating topological insulator Bi2Te2Se

Mesoscale and Nanoscale Physics 2015-06-16 v1 Materials Science

Authors: M. Neupane , S. Basak , N. Alidoust , S. -Y. Xu , Chang Liu , I. Belopolski , G. Bian , J. Xiong , H. Ji , S. Jia , S. -K. Mo , M. Bissen , M. Severson , H. Lin , N. P. Ong , T. Durakiewicz , R. J. Cava , A. Bansil , M. Z. Hasan

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Using circular dichroism-angle resolved photoemission spectroscopy (CD-ARPES), we report a study of the effect of angular momentum transfer between polarized photons and topological surface states on the surface of highly bulk insulating topological insulator Bi2Te2Se. The photoelectron dichroism is found to be strongly modulated by the frequency of the helical photons including a dramatic sign-flip. Our results suggest that the observed dichroism and its sign-flip are consequences of strong coupling between the photon field and the spin-orbit nature of the Dirac modes on the surface. Our studies reveal the intrinsic dichroic behavior of topological surface states and point toward the potential utility of bulk insulating topological insulators in device applications.

Keywords

topological insulator Bi2Te2Se circular dichroism ARPES surface states spin-orbit coupling dichroism

Cite

@article{arxiv.1307.7311,
  title  = {Oscillatory surface dichroism of an insulating topological insulator Bi2Te2Se},
  author = {M. Neupane and S. Basak and N. Alidoust and S. -Y. Xu and Chang Liu and I. Belopolski and G. Bian and J. Xiong and H. Ji and S. Jia and S. -K. Mo and M. Bissen and M. Severson and H. Lin and N. P. Ong and T. Durakiewicz and R. J. Cava and A. Bansil and M. Z. Hasan},
  journal= {arXiv preprint arXiv:1307.7311},
  year   = {2015}
}

Comments

5 pages, 4 figures

Oscillatory surface dichroism of an insulating topological insulator Bi2Te2Se

Abstract

Keywords

Cite

Comments

Related papers