DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 75: Metal Substrates: Growth Studies

O 75.1: Talk

Wednesday, March 18, 2020, 15:00–15:15, WIL C107

Growth studies of the potential Rashba surface alloy Tl on Ag(111) — •Patrick Härtl and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

It is well known, that surface alloys of Ag(111) with heavy post-transition metals, such as the group V element Bi or the group IV element Pb, i.e., BiAg2 [1] or PbAg2 [2], respectively, exhibit a giant spin–orbit coupling resulting in Rashba spin-split surface states. Looking in the periodic system it can be speculated whether surface alloying of Ag with the group III element thallium (Tl) results in a comparable electronic structure. As a first step towards this goal we have studied the growth of Tl on Ag(111) by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), and scanning tunneling microscopy (STM). LEED reveals a (√3 × √3)Tl/Ag(111)R30 structure at submonolayer coverage and additional (4 √3 × 4 √3) spots for thicker films. The intensity and sharpness of the (√3 × √3) is used to identify optimal growth conditions. The LEED results are compared to real space data by making use of Fourier transformed STM images. STM data obtained on Tl films with a thickness of several atomic layers still show a pronounced moiré pattern, thereby indicating a sizable rotation of the Tl lattice with respect to the underlying Ag(111) substrate. The results will be discussed by comparison with Bi and Pb films.
[1] L. El-Kareh et al., Phys. Rev. Lett. 110, 176803 (2013).
[2] L. El-Kareh et al., New Jour. Phys. 16, 045017 (2014).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden