Breaking of Inversion Symmetry and Interlayer Electronic Coupling in Bilayer Graphene Heterostructure by Structural Implementation of High Electric Displacement Fields

Kolmer, Marek; Ko, Wonhee; Hall, Joseph; Chen, Shen; Zhang, Jianhua; Zhao, Haijun; Ke, Liqin; Wang, Cai-Zhuang; Li, An-Ping; Tringides, Michael C.

doi:10.1021/acs.jpclett.2c02407

Title: Breaking of Inversion Symmetry and Interlayer Electronic Coupling in Bilayer Graphene Heterostructure by Structural Implementation of High Electric Displacement Fields

Journal Article · Thu Dec 08 00:00:00 EST 2022 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.2c02407· OSTI ID:1905244

^[1];

^[2]; Hall, Joseph ^[3];

^[3]; Zhang, Jianhua ^[4]; Zhao, Haijun ^[5]; Ke, Liqin ^[1];

^[3];

^[2];

^[3]

Ames Lab., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Hainan University, Haikou (China)
Southeast Univ., Nanjing (China)

Controlling the interlayer coupling in two-dimensional (2D) materials generates novel electronic and topological phases. Its effective implementation is commonly done with a transverse electric field. However, phases generated by high displacement fields are elusive in this standard approach. Here, we introduce an exceptionally large displacement field by structural modification of a model system: AB-stacked bilayer graphene (BLG) on a SiC(0001) surface. We show that upon intercalation of gadolinium, electronic states in the top graphene layers exhibit a significant difference in the on-site potential energy, which effectively breaks the interlayer coupling between them. As a result, for energies close to the corresponding Dirac points, the BLG system behaves like two electronically isolated single graphene layers. This is proven by local scanning tunneling microscopy (STM)/spectroscopy, corroborated by density functional theory, tight binding, and multiprobe STM transport. Further, the work presents metal intercalation as a promising approach for the synthesis of 2D graphene heterostructures with electronic phases generated by giant displacement fields.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1905244

Report Number(s):: IS-J-10,955

Journal Information:: Journal of Physical Chemistry Letters, Vol. 13, Issue 49; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Breaking of Inversion Symmetry and Interlayer Electronic Coupling in Bilayer Graphene Heterostructure by Structural Implementation of High Electric Displacement Fields

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