Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 47: Poster Session - 2D Materials: Electronic Structure, Excitations, etc.
O 47.2: Poster
Tuesday, March 17, 2020, 18:15–20:00, P2/EG
Develop strain manipulation techniques for STM measurement — •Jz-Yuan Juo1, Bong Gyu Shin1, Jack Maughan1, Charlie Shaw1, Soon Jung Jung1, and Klaus Kern1,2 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, DE-70569Stuttgart, Germany — 2Institut de Physique, École Polytechnique Fédérale deLausanne, CH-1015 Lausanne, Switzerland
An atomic-scale understanding of how strain affects the electronic properties is essential for the implementation of two-dimensional (2D) materials into flexible electronics. However, the combination of low temperature scanning tunneling microscopy (STM) and strain-tunable devices remains challenging due to its technical limitations. The strain controller should fit in the STM sample holder with a maximum size of 1 cm3 and function at ∼4 K. It should also be compatible with ultrahigh vacuum. Here, we developed a motor-based strain controller, which enabled us to apply uniaxial bending strain in situ. The polyimide film with surface roughness of ∼0.5 nm was chosen to minimize the substrate roughness induced strain. The 2D materials grown by chemical vapor deposition were transferred onto the polyimide film and tighten by clamps to deliver the strain to the 2D material effectively. The uniaxial deformation was confirmed by phonon shifts measured in Raman spectroscopy.