Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 46.11: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Charge-ordered state in the low-temperature phase of Pb/Si(111) — •Florian Adler1, Manuel Laubach2, Stephan Rachel2, Jörg Schäfer1, and Ralph Claessen11Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Germany — 2Institut für Theoretische Physik, Technische Universität Dresden, Germany

Two-dimensional triangular lattices of Group IV adatoms on diamond lattice substrates provide a rich playground for experimental studies and many-body calculation techniques. For the system investigated in this work, 1/3 monolayer of Pb on Si(111), preceeding studies have noted a phase transition from √3 × √3 to 3 × 3 at 86 K. In our high-resolution scanning tunneling microscopy and spectroscopy measurements in the low-temperature phase, we have unveiled the formation of a charge-ordered state by carefully mapping the local density of states. Furthermore, we find a structural rearrangement with a 2-up/1-down configuration. These results are supported by state-of-the-art many body calculations using the Variational Cluster Approach (VCA), which is sensitive to both spin- and charge-densitiy wave instabilities. I will present a comparison of our measurements and the latest results from VCA calculations.

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