DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2007 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

O: Fachverband Oberflächenphysik

O 34: Methods: Atomic and Electronic Structure I

O 34.7: Talk

Tuesday, March 27, 2007, 17:15–17:30, H42

1TTiSe2: Semimetal or Semiconductor? — •Julia Rasch, Torsten Stemmler, and Recardo Manzke — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin

Even though the semimetallic behavior of 1TTiSe2 seemed to be well established by band structure calculations and previous photoemission results (see e.g. [1]), this conclusion has been challenged recently. Two high-resolution photoemission investigations deduced semiconducting behavior, however with a very small band gap [2,3]. But such a conclusion is afflicted, on principle, by the problem of measuring an unoccupied conduction band by photoemission.

In the present contribution this problem is solved by the idea of H2 O adsorption onto the van der Waals-like surface, causing a distinct bending of the bands and resulting in an completely filled lowest conduction band. The detailed analysis yields undoubtedly semiconducting behavior for 1TTiSe2 and interesting new properties of semiconductors with extremely small band gaps.

[1] O. Anderson, R. Manzke, M. Skibowski, Phys. Rev. Letters 55, 2188 (1985) [2] K. Rossnagel, L. Kipp, M. Skibowski, Phys. Rev. B 65, 235101 (2002) [3] T.E. Kidd, T. Miller, M.Y. Chou, T.-C. Yang, Phys. Rev. Letters 88, 226401 (2002)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2007 > Regensburg