Nano Research

, Volume 3, Issue 11, pp 800–806

Van Hove singularities as a result of quantum confinement: The origin of intriguing physical properties in Pb thin films

Authors

  • Yu Jie Sun
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
    • WPI Advanced Institute for Materials ResearchTohoku University
  • S. Souma
    • WPI Advanced Institute for Materials ResearchTohoku University
  • Wen Juan Li
    • Institute of PhysicsThe Chinese Academy of Sciences
  • T. Sato
    • Department of PhysicsTohoku University
  • Xie Gang Zhu
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
  • Guang Wang
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
  • Xi Chen
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
  • Xu Cun Ma
    • Institute of PhysicsThe Chinese Academy of Sciences
  • Qi Kun Xue
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
    • WPI Advanced Institute for Materials ResearchTohoku University
    • Institute of PhysicsThe Chinese Academy of Sciences
    • Key Laboratory of Atomic and Nanosciences, Department of PhysicsTsinghua University
  • T. Takahashi
    • WPI Advanced Institute for Materials ResearchTohoku University
    • Department of PhysicsTohoku University
  • T. Sakurai
    • WPI Advanced Institute for Materials ResearchTohoku University
Open AccessResearch Article

DOI: 10.1007/s12274-010-0047-z

Abstract

In situ angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STS) have been used to study the electronic structure of Pb thin films grown on a Si(111) substrates. The experiments reveal that the electronic structure near the Fermi energy is dominated by a set of m-shaped subbands because of strong quantum confinement in the films, and the tops of the m-shaped subbands form an intriguing ring-like Van Hove singularity. Combined with theoretical calculations, we show that it is the Van Hove singularity that leads to an extremely high density of states near the Fermi energy and the recently reported strong oscillations (with a period of two monolayers) in various properties of Pb films.

Keywords

Van Hove singularity angle-resolved photoemission spectroscopy (ARPES) scanning tunneling spectroscopy (STS) Pb film

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010