报告人Prof. Philip Hofmann

        Aarhus University, Denmark(丹麦奥胡斯大学)

 

题目The surfaces of bismuth: from two-dimensional metals to the quantum spin Hall effect

摘要:In sharp contrast to the semi-metallic bulk, the surfaces of Bi form nearly two-dimensional metals, caused by the presence of metallic surface states. In a simple picture, the main reason for the existence of these states is the loss of inversion symmetry at the surface, combined with the strong spin-orbit interaction in Bi. The surface states are almost completely non-degenerate with respect to the electron's spin. This has interesting consequences for the electron dynamics, several examples of which will be given.

The Bi surfaces are electronically very similar to the surfaces of certain BiSb alloys which have been shown to be topological insulators and, indeed, Bi can be viewed as the parent material for these insulators. It will be shown that the surface of a vicinal Bi surface supports a one-dimensional non-degenerate state which bears great similarity to the edge state in the quantum spin Hall effect.

 

报告人简历

 

1992-1994    PhD student,Fritz-Haber-Institut der

                     Max-Planck-Gesellschaft, Berlin, Germany

1997-1998    work-group leader at the Fritz-Haber-Institut der Max-Planck-Gesellschaft

1998 - present  professor, Institute for Storage Ring Facilities and

                    Interdisciplinary Nanoscience Center, University of Aarhus, Denmark

 

Research awards:   

Ernst-Eckard-Koch award of the Berlin Electron Storage Ring Society BESSY (1994), Otto-Hahn-Medaille of the Max-Planck-Society (1995), Carl Ramsauer award of the AEG / Daimler Benz AG (1996), Visiting Professorship of the Leverhulme Trust (2007)

 

Publications:

Contains circa 100 entries in international, peer-reviewed journals, including:

        Nature: 2   

        Nature Nanotechnology: 1

        Physical Review Letters: 13

The work is highly cited with more than 1800 citations in total and an H-factor of 25.