Modifying the Surface of a Rashba-Split Pb-Ag Alloy Using Tailored Metal-Organic Bonds.
Hybridization-related modifications of the first metal layer of a metal-organic interface are difficult to access experimentally and have been largely neglected so far. Here, we study the influence of specific chemical bonds (as formed by the organic molecules CuPc and PTCDA) on a Pb-Ag surface alloy. We find that delocalized van der Waals or weak chemical π-type bonds are not strong enough to alter the alloy, while localized σ-type bonds lead to a vertical displacement of the Pb surface atoms and to changes in the alloy's surface band structure. Our results provide an exciting platform for tuning the Rashba-type spin texture of surface alloys using organic molecules.
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.|Graduate School of Excellence Materials Science in Mainz, Erwin Schroedinger Straße 46, 67663 Kaiserslautern, Germany.
Benjamin
B
Stadtmüller
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.
Johannes
J
Seidel
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.
Norman
N
Haag
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.
Lisa
L
Grad
Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany.
Christian
C
Tusche
Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich-Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
Gerben
G
van Straaten
Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich-Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
Markus
M
Franke
Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany.
Jürgen
J
Kirschner
Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich-Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
Christian
C
Kumpf
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.
Mirko
M
Cinchetti
Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany.
Martin
M
Aeschlimann