Now showing items 1-3 of 3

    • Surface oxidation of the topological insulator Bi2Se3 

      Green, Avery J.; Dey, Sonal; An, Yong Q.; O'Brien, Brendan; O'Mullane, Samuel; Thiel, Bradley; Diebold, Alain C. (Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2016)
      An understanding of the aging and oxidation of the (0001) surface of Bi2Se3 is critical to a comprehensive physical picture of its topologically protected surface states. Here, the authors contribute new experimental ...
    • Tracking quintuple layer oxidation on cleaved Bi2Se3 by optical second-harmonic anisotropy 

      An, Yong Q.; Green, Avery J.; Diebold, Alain C. (Physical Review B, 2016)
      We find that the major and minor intensity lobes of a measured rotational-anisotropy pattern of optical second-harmonic generation (SHG) from a cleaved Bi2Se3 (111) surface can gradually change with time and eventually ...
    • Transiently stimulated second-harmonic generation from silicon nanogratings 

      An, Yong Q.; Diebold, Alain C. (American Physical Society, 2017-11-29)
      We observe that second-harmonic (SH) light generated by a femtosecond probe pulse from Si nanograting surfaces can be enhanced by a correlating pump pulse. Time-resolved anisotropy analysis shows that the enhancement arises ...