Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Graphene, 2D and Twisted Materials
TT 4.6: Vortrag
Montag, 9. März 2026, 10:45–11:00, HSZ/0105
Probing doping profiles in large-angle twisted bilayer graphene by Fabry-Perot interference — •Alina Mrenca-Kolasinska1, Curtis McDowell2, Thiti Taychatanapat2, and Ming-Hao Liu3 — 1AGH University of Krakow, Faculty of Physics and Applied Computer Science, Poland — 2Chulalongkorn University, Department of Physics, Faculty of Science, Patumwan, Bangkok, Thailand — 3National Cheng Kung University, Department of Physics, Tainan, Taiwan
In graphene, p-n junctions can be induced by electrostatic gating. Fabry-Perot (FP) interferometers formed in gate-defined bipolar cavities have been used to probe Klein tunneling [1], miniband structure in moire superlattices [2], and transport in decoupled bilayer graphene [3]. In this work, we investigate a decoupled large-angle twisted bilayer graphene device that shows rich fringe patterns that resemble FP oscillations. We postulate that they originate from extra electronic cavities created by unintentional local doping in the device. Our quantum transport simulations incorporating this assumption reproduce the observed patterns. Our findings demonstrate that disorder can lead to unexpected and rich structures that can be probed by transport.
[1] A.F. Young, P. Kim, Nat. Phys. 5 (2009) 222.
[2] C. Handschin et al. , Nano Lett. 17 (2017) 328.
[3] P. Rickhaus et al. , Sci. Adv. 6 (2020) eaay8409.
Keywords: Fabry-Perot interferometer; large-angle twisted bilayer graphene; quantum transport