Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Focus Session: Strongly Correlated Quantum States in Moire Heterostructures (joint session TT/HL/MA)
HL 19.4: Topical Talk
Dienstag, 18. März 2025, 11:15–11:45, H36
Probing the Band Structures of Multilayer Graphene Using the Quantum Twisting Microscope — •Martin Lee1,2, Ipsita Das1,2, János Papp1,2, Marc Currle1, Jiazhuo Li1,2, Mudit Bhatt1,2, Jonah Herzog-Arbeitman3, Jiabin Yu3, Zhiyuan Zhou3, Markus Becherer4, Philipp Altpeter1, Christian Obermayer1, Heribert Lorenz1, Kenji Watanabe5, Takashi Taniguchi5, Bogdan Andrei Bernevig3,6,7, and Dmitri Efetov1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, München, Germany — 2Munich Center for Quantum Science and Technology, München, Germany — 3Department of Physics, Princeton University, Princeton, New Jersey, USA — 4School of Computation Information and Technology, Technical University of Munich, Germany — 5National Institute of Material Sciences, Tsukuba, Japan — 6Donostia International Physics Center, Donostia-San Sebastian, Spain — 7IKERBASQUE, Basque Foundation for Science, Bilbao, Spain
Understanding the band-structure is foundational in describing the behavior of electrons in crystalline systems. While the tight-binding model effectively captures the non-interacting band-structures in materials like graphene, it relies on analytically or numerically derived hopping parameters. In this talk, we present the development of a quantum twisting microscope (QTM), which allows the k-resolved tunneling spectroscopy between the electronic states at the 2D tip and the 2D sample by twisting in-situ. Our QTM measurements allow us to extract the hopping parameters that agree with theoretical predictions.
Keywords: quantum twisting microscope; graphene; tunneling spectroscopy; scanning probe microscopy; band structure