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Berlin Physics Colloquium: Prof. Dr. Ralph Claessen "Atomic monolayers as synthetic topological insulators"

May 05, 2022 | 06:30 PM

Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg

Two-dimensional topological insulators (2D TI) are characterized by producing spin-polarized conduction band states at their one-dimensional edges, leading to the quantum spin Hall (QSH) effect. As shown in the seminal work of Kane and Mele, graphene would represent the simplest realization of a QSH insulator if it did not have a nearly vanishing spin-orbit interaction. Heavier group IV monolayers (such as the Sn-derived "stanene") could remedy this problem, but convincing proof of such 2D TIs has not yet been provided. Recently, we have discovered that the neighboring groups III and V in the periodic table offer a promising alternative. In this talk, I will present the rational design and epitaxial synthesis, as well as angular-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy studies of two of these synthetic QSH insulators: Bi- ("bismuthene") [1-3] and In-monolayers ("indenene") [4] on SiC(0001) substrates.

Host: Prof. Dr. Martin Wolf, Physikalische Gesellschaft zu Berlin

The colloquium has been rescheduled from the original 01/13/2022 to 05/05/2022.

Time & Location

May 05, 2022 | 06:30 PM

Magnus-Haus Am Kupfergraben 7, 10117 Berlin

Further Information

About Berlin Physics Colloquium

The Berlin Physics Colloquium in the Magnus House was initiated in 1998 by the Physical Society of Berlin. The colloquium is organised jointly by the Freie Universität Berlin, the Humboldt University of Berlin, the Technical University of Berlin and the University of Potsdam with the support of the Wilhelm and Else Heraeus Foundation. It takes place on the first or second Thursday of every month, except in March, August and September.