Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Electronic structure of surfaces: Spectroscopy, surface states – Poster
O 42.5: Poster
Tuesday, March 10, 2026, 14:00–16:00, P2
Structure and Electronic Properties of (Bi, Pb) Atom Layer Structures studied by ARPES and STM — •Lars Konermann1, Wen Si2, Hiroko Abe1, Masaki Imamura3, Masahiro Haze2, Kazutoshi Takahashi3, Yukio Hasegawa2, and Akari Takayama1,4 — 1Waseda Univ., Shinjuku, Japan — 2ISSP, Univ. of Tokyo, Kashiwa, Japan — 3SL Center, Saga Univ., Tosu, Japan — 4IMRAM, Tohoku Univ., Sendai, Japan
In Single-atom layer (SAL) structures comprised of heavy elements on semiconductor substrates, spin-split electronic states occur due to strong spin-orbit interactions and the breaking of the spatial inversion symmetry, known as the Rashba effect. For (Bi, Pb) on Si or Ge, spin-splitting electronic bands have been demonstrated both theoretically and experimentally. Furthermore, the possibility of a superconducting transition is anticipated suggesting spin-triplet superconductivity. Albeit, experimental confirmation has not yet been obtained.
We investigated the atomic and electronic structures of (Bi, Pb)/Si(111) and Ge(111) structures using cryogenic scanning tunneling microscopy (STM) and spectroscopy (STS), as well as angle-resolved photoemission spectroscopy (ARPES) with synchrotron radiation. A series of experiments was conducted to evaluate the sample: observation of the periodic atomic arrangement, determination of the Pb/Bi composition ratio, detailed band dispersion, and investigation of the electronic states at ultra-low temperatures.
In this presentation, we will present these experimental results and discuss the potential for superconductivity with the Rashba effect.
Keywords: 2-dimensional systems; Electronic structure; Angle-resolved photoemission spectroscopy; Scanning tunneling microscopy; Scanning tunneling spectroscopy