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Title: Characterization of electronic structure of periodically strained graphene

Abstract

We induced periodic biaxial tensile strain in polycrystalline graphene by wrapping it over a substrate with repeating pillar-like structures with a periodicity of 600 nm. Using Raman spectroscopy, we determined to have introduced biaxial strains in graphene in the range of 0.4% to 0.7%. Its band structure was characterized using photoemission from valance bands, shifts in the secondary electron emission, and x-ray absorption from the carbon 1s levels to the unoccupied graphene conduction bands. It was observed that relative to unstrained graphene, strained graphene had a higher work function and higher density of states in the valence and conduction bands. Furthermore, we measured the conductivity of the strained and unstrained graphene in response to a gate voltage and correlated the changes in their behavior to the changes in the electronic structure. From these sets of data, we propose a simple band diagram representing graphene with periodic biaxial strain.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Hewlett-Packard Lab., Palo Alto, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1263395
Alternate Identifier(s):
OSTI ID: 1224928
Report Number(s):
SLAC-PUB-16639
Journal ID: ISSN 0003-6951; APPLAB; arXiv:1511.01921
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 18; 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; MATSCI; graphene; conduction bands; work functions; photoemission; band gap

Citation Formats

Aslani, Marjan, Garner, C. Michael, Kumar, Suhas, Nordlund, Dennis, Pianetta, Piero, and Nishi, Yoshio. Characterization of electronic structure of periodically strained graphene. United States: N. p., 2015. Web. doi:10.1063/1.4934701.
Aslani, Marjan, Garner, C. Michael, Kumar, Suhas, Nordlund, Dennis, Pianetta, Piero, & Nishi, Yoshio. Characterization of electronic structure of periodically strained graphene. United States. doi:10.1063/1.4934701.
Aslani, Marjan, Garner, C. Michael, Kumar, Suhas, Nordlund, Dennis, Pianetta, Piero, and Nishi, Yoshio. Tue . "Characterization of electronic structure of periodically strained graphene". United States. doi:10.1063/1.4934701. https://www.osti.gov/servlets/purl/1263395.
@article{osti_1263395,
title = {Characterization of electronic structure of periodically strained graphene},
author = {Aslani, Marjan and Garner, C. Michael and Kumar, Suhas and Nordlund, Dennis and Pianetta, Piero and Nishi, Yoshio},
abstractNote = {We induced periodic biaxial tensile strain in polycrystalline graphene by wrapping it over a substrate with repeating pillar-like structures with a periodicity of 600 nm. Using Raman spectroscopy, we determined to have introduced biaxial strains in graphene in the range of 0.4% to 0.7%. Its band structure was characterized using photoemission from valance bands, shifts in the secondary electron emission, and x-ray absorption from the carbon 1s levels to the unoccupied graphene conduction bands. It was observed that relative to unstrained graphene, strained graphene had a higher work function and higher density of states in the valence and conduction bands. Furthermore, we measured the conductivity of the strained and unstrained graphene in response to a gate voltage and correlated the changes in their behavior to the changes in the electronic structure. From these sets of data, we propose a simple band diagram representing graphene with periodic biaxial strain.},
doi = {10.1063/1.4934701},
journal = {Applied Physics Letters},
number = 18,
volume = 107,
place = {United States},
year = {2015},
month = {11}
}

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