Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.1: Vortrag
Montag, 12. März 2018, 09:30–09:45, A 053
ARPES analysis of the MoxW1−xTe2-System — •Erik Haubold1, Dmitry Efremov1, Matthias Gillig1, Boy Roman Piening1, Saicharan Aswartham1, Alexander Fedorov1, Yevhen Kushnirenko1, Thirupathaiah Setti1, Igor Morozov1,3, Timur Kim2, Christian Hess1, Bernd Büchner1, and Sergey Borisenko1 — 1IFW Dresden, 01069 Dresden, Germany — 2Diamond Light Source, Didcot OX11 0DE, United Kingdom — 3Moscow State University, Moscow 119991, Russia
WTe2 and the corresponding sister compound MoTe2 sparked a lot of interest and research as potential Weyl semimetals or in the field of Dirac and Weyl semimetals in general. Although the stoichiometric compounds as well as some intermediate doping levels have been analysed, no complete thorough investigation of the whole series has been carried out.
Recent transport data measured at IFW Dresden indicates a nonlinear behaviour of the electrical and magnetic properties when going from pure WTe2 to MoTe2. We have collected ARPES data for the whole series of materials and analysed their electronic structure to clarify whether the changes in the bandstructure can explain this.
Initial results show a significant shift of bands close to the Fermi energy resulting in a change of the size of the Fermi surfaces. We compare these results to transport data and calculations to check whether such shifts explain the nonlinearity.