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Targeted Dy intercalation under graphene/SiC for tuning its electronic band structure

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [1];  [2];  [1];  [1]
  1. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
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Metal intercalation of graphene is a promising method to tune its electronic band structure and generate novel electronic and topological phases. The tuning depends critically on the ability to bond the intercalated atoms at predesigned, subsurface interlayer locations because the emerging band structure depends on metal location. In this work, we have studied Dy intercalation under single-layer graphene (SLG) on SiC using spot profile analysis–low-energy electron diffraction and scanning tunneling microscopy (STM). The experimental work is complemented with density-functional theory (DFT) analysis. Because different diffraction spots originate from different subsurface interlayer regions, it is possible to identify changes in the intercalation location by monitoring the spot intensity as a function of growth conditions. DFT calculations of the chemical potential as a function of intercalated Dy coverage support the variation of the stability of the intercalated phase at different intercalated locations. The preferred location is confirmed from STM studies showing the removal of the 6 × 6 moiré corrugation at the preferred location, observed at higher Dy coverage.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1923463
Alternate ID(s):
OSTI ID: 1908257
Report Number(s):
IS-J-10,981
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 107; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

2-dimensional systems
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
electron diffraction
graphene
growth
intercalation
low-energy electron diffraction
nucleation
nucleation on surfaces
spot-profile analysis LEED
surface and interfacial phenomena
surface diffusion
surfaces