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Title: Temperature-modulated electronic structure of graphene on SiC: Possible roles of electron-electron interaction and strain

Abstract

We have iobserved the electron band structure of graphene epitaxially grown on an SiC substrate using angle-resolved photoemission spectroscopy. The conical energy spectrum of graphene exhibits a minimum slope at ~50 K, which is accompanied by the minimum separation between its two branches. These observations provide a viable route towards the engineering of the electronic properties of graphene using temperature, while the latter suggests a possible evidence of gap engineering via strain induced by the substrate and modulated by temperature.

Authors:
ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [2]
  1. Pusan National Univ., Busan (South Korea)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Research Foundation of Korea (NRF)
OSTI Identifier:
1530310
Alternate Identifier(s):
OSTI ID: 1411480
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 111; Journal Issue: 23; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Hwang, Choongyu, Hwang, Jinwoong, Lee, Ji-Eun, Denlinger, Jonathan, and Mo, Sung-Kwan. Temperature-modulated electronic structure of graphene on SiC: Possible roles of electron-electron interaction and strain. United States: N. p., 2017. Web. doi:10.1063/1.4986425.
Hwang, Choongyu, Hwang, Jinwoong, Lee, Ji-Eun, Denlinger, Jonathan, & Mo, Sung-Kwan. Temperature-modulated electronic structure of graphene on SiC: Possible roles of electron-electron interaction and strain. United States. doi:10.1063/1.4986425.
Hwang, Choongyu, Hwang, Jinwoong, Lee, Ji-Eun, Denlinger, Jonathan, and Mo, Sung-Kwan. Wed . "Temperature-modulated electronic structure of graphene on SiC: Possible roles of electron-electron interaction and strain". United States. doi:10.1063/1.4986425. https://www.osti.gov/servlets/purl/1530310.
@article{osti_1530310,
title = {Temperature-modulated electronic structure of graphene on SiC: Possible roles of electron-electron interaction and strain},
author = {Hwang, Choongyu and Hwang, Jinwoong and Lee, Ji-Eun and Denlinger, Jonathan and Mo, Sung-Kwan},
abstractNote = {We have iobserved the electron band structure of graphene epitaxially grown on an SiC substrate using angle-resolved photoemission spectroscopy. The conical energy spectrum of graphene exhibits a minimum slope at ~50 K, which is accompanied by the minimum separation between its two branches. These observations provide a viable route towards the engineering of the electronic properties of graphene using temperature, while the latter suggests a possible evidence of gap engineering via strain induced by the substrate and modulated by temperature.},
doi = {10.1063/1.4986425},
journal = {Applied Physics Letters},
number = 23,
volume = 111,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: (a) An LEED image of graphene on an SiC(0001) substrate taken at 98.8 eV. The white circle denotes graphene 1 × 1 LEED pattern in addition to the 6$\sqrt{3}$ × 6$\sqrt{3}$ phase corresponding to the graphene/substrate superstructure. (b) ARPES intensity maps of graphene on an SiC(0001) substrate takenmore » perpendicular to the ΓK direction of the graphene unit cell denoted by the red line in the inset at 6 K, 55 K, and 170 K. The white arrow denotes the Dirac energy where conduction and valence bands of graphene meet at a single point. The red lines are Lorentzian fits to the ARPES maps.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.