SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster: Transport

TT 16.10: Poster

Montag, 27. März 2023, 15:00–18:00, P2/OG4

Transport properties of pn junctions in 2D materials: Graphene vs MoS₂ — •Yu-Ting Xiao and Ming-Hao Liu — Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan

Graphene and monolayer MoS₂ both belong to the family of 2D materials. The former is known as a Dirac semimetal where electrons behave like relativistic Dirac fermions due to the gapless energy band linear in momentum, while the latter shows typical semiconducting behaviors due to the gapped energy band quadratic in momentum, with which electrons behave as standard Schrödinger fermions. In terms of transport, Dirac and Schrödinger electrons exhibit distinct behaviors, among which the so-called Klein tunneling [1] is perhaps one of the best known. To further identify their difference in transport properties, here we perform quantum transport simulations for pn junctions in various 2D systems, including graphene, MoS₂, and other toy models for 2D semiconductors. Our results identify transport properties that are unique to Dirac fermions as well as those that do not significantly differ from the two.

[1] M. Katsnelson, K. Novoselov, and A. Geim, Nat. Phys. 2, 620 (2006)