B5.2 – Electronic and transport properties in bilayer graphene as template for ordered molecular adsorption
Principle Investigator: Prof. Dr. Annika Kurzmann
The main goal of this project is to use bilayer graphene as template for ordered adsorption of molecules. Bilayer graphene is a zero-bandgap semiconductor in its pristine form, but a non-zero bandgap can be induced by applying a displacement field. This bandgap can be used to electrostatically define nanostructures, like quantum dots [1,2] and quantum point contacts [3] in bilayer graphene. Using transport measurements at different temperatures the electronic and transport properties of bilayer graphene as template for ordered molecular absorption will be studied. The molecules will be integrated in transistors as well as nanostructures using dry transfer of two-dimensional materials and nanofabrication of gates.
Within the project van der Waal heterostructures are fabricated using dry transfer of two-dimensional materials. Followed by state-of-the-art nanofabrication methods such as electron beam lithography, etching, and metal deposition. The samples are characterized using low temperature transport measurements, but also high-resolution optical measurements are possible.
References
[1] M. Eich, F. Herman, R. Pisoni, H. Overweg, A. Kurzmann, Y. Lee, P. Rickhaus, K. Watanabe, T. Taniguchi, M. Sigrist, T. Ihn, and K. Ensslin, Phys. Rev. X 8, 031023 (2018).
[2] C. Tong, R. Garreis, A. Knothe, M. Eich, A. Sacchi, K. Watanabe, T. Taniguchi, V. Fal’ko, T. Ihn, K. Ensslin, and A. Kurzmann, Nano Letters 21 (2), 1068-1073 (2021).
[3] Y. Lee, A. Knothe, H. Overweg, M. Eich, C. Gold, A. Kurzmann, V. Klasovika, T. Taniguchi, K. Wantanabe, V. Fal’ko, T. Ihn, K. Ensslin, P. Rickhaus, Phys. Rev. Let. 124 (12), 126802 (2020).
The ideal candidate has a master’s degree in physics. Experiences in nanofabrication and/or transport measurements are beneficial.