Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter I

O 48.1: Topical Talk

Donnerstag, 26. März 2009, 10:30–11:00, HSZ 02

The Rashba and quantum size effects in ultrathin Bi films — •Toru Hirahara — Department of Physics, University of Tokyo, Japan

Semimetal bismuth (Bi) is one of the most extensively studied elements in solid state because of its extreme physical properties. For example, Bi has been employed to examine the quantum size effect (QSE) in thin films or nanowires due to its extraordinary large Fermi wavelength. An oscillation in the conductivity or the Hall coefficient with film thickness due to the QSE was predicted theoretically [1]. Furthermore since Bi is a very heavy element, spin-orbit coupling (SOC) effects play a dominant role in the electronic and transport properties, which can be found in the large atomic splitting (1.5 eV), or the anti-localization behavior in magnetotransport measurements [2].

When the system downsizes to the nanometer scale, it can be expected that the contributions from the surface states will make the system more intriguing. In this talk, I will present our recent results obtained for a well-defined ultrathin Bi film [3] utilizing the state-of-art spin- and angle- resolved photoemission spectroscopy, first-principles calculations, and surface-sensitive conductivity measurements. Particular focus will be given on the QSE and SOC effect at the surface (Rashba effect).

[1] V. B. Sandomirskii, Sov. Phys. JETP 25, 101(1967). [2] F. Komori et al., 52, 368(1983). [3] T. Nagao et al., Phys. Rev. Lett. 93, 105501 (2004).