Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 43: Twisted Materials / Systems (joint session TT/HL)

HL 43.6: Talk

Wednesday, March 19, 2025, 18:15–18:30, H31

Twisted bilayer MoS₂ under electric fields: A system with tunable symmetry — •Aitor Garcia-Ruiz^1,2 and Ming-Hao Liu¹ — ¹National Cheng Kung University, Tainan, Taiwan — ²National Graphene Institute, University of Manchester, Manchester, United Kingdom

Gate voltages take full advantage of two-dimensional systems, making it possible to explore novel states of matter by controlling their electron concentration or applying perpendicular electric fields. Here, we study the electronic properties of small-angle twisted bilayer MoS₂ under a strong electric field. We show that the transport across one of its constituent layers can be effectively regarded as a two-dimensional electron gas under a nanoscale potential. We find that the band structure of such system reconstructs following two fundamentally different symmetries depending on the orientation of the external electric field, namely, hexagonal or honeycomb. By studying this system under magnetic fields, we demonstrate that this duality not only translates into two different transport responses, but also results in having two different Hofstadter’s spectra. Our work opens up a new route for the creation of controllable artificial superlattices in van der Waals heterostructures.

Keywords: Twistronics; Artificial lattices; Quantum transport; Hofstadter’s Butterfly; Chern Numbers