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Title: Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons

Abstract

Graphene's isolation launched explorations of fundamental relativistic physics originating from the planar honeycomb lattice arrangement of the carbon atoms, and of potential technological applications in nanoscale electronics. Bottom-up fabricated atomically-precise segmented graphene nanoribbons, SGNRs, open avenues for studies of electrical transport, coherence, and interference effects in metallic, semiconducting, and mixed GNRs, with different edge terminations. Conceptual and practical understanding of electric transport through SGNRs is gained through nonequilibrium Green's function (NEGF) conductance calculations and a Dirac continuum model that absorbs the valence-to-conductance energy gaps as position-dependent masses, including topological-in-origin mass-barriers at the contacts between segments. The continuum model reproduces the NEGF results, including optical Dirac Fabry-Pérot (FP) equidistant oscillations for massless relativistic carriers in metallic armchair SGNRs, and an unequally-spaced FP pattern for mixed armchair-zigzag SGNRs where carriers transit from a relativistic (armchair) to a nonrelativistic (zigzag) regime. This provides a unifying framework for analysis of coherent transport phenomena and interpretation of forthcoming experiments in SGNRs.

Authors:
 [1];  [1];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Georgia Tech Research Corporation (GATECH), Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1204438
Grant/Contract Number:  
FG05-86ER45234
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; materials science; physics

Citation Formats

Yannouleas, Constantine, Romanovsky, Igor, and Landman, Uzi. Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons. United States: N. p., 2015. Web. doi:10.1038/srep07893.
Yannouleas, Constantine, Romanovsky, Igor, & Landman, Uzi. Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons. United States. https://doi.org/10.1038/srep07893
Yannouleas, Constantine, Romanovsky, Igor, and Landman, Uzi. Tue . "Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons". United States. https://doi.org/10.1038/srep07893. https://www.osti.gov/servlets/purl/1204438.
@article{osti_1204438,
title = {Interplay of relativistic and nonrelativistic transport in atomically precise segmented graphene nanoribbons},
author = {Yannouleas, Constantine and Romanovsky, Igor and Landman, Uzi},
abstractNote = {Graphene's isolation launched explorations of fundamental relativistic physics originating from the planar honeycomb lattice arrangement of the carbon atoms, and of potential technological applications in nanoscale electronics. Bottom-up fabricated atomically-precise segmented graphene nanoribbons, SGNRs, open avenues for studies of electrical transport, coherence, and interference effects in metallic, semiconducting, and mixed GNRs, with different edge terminations. Conceptual and practical understanding of electric transport through SGNRs is gained through nonequilibrium Green's function (NEGF) conductance calculations and a Dirac continuum model that absorbs the valence-to-conductance energy gaps as position-dependent masses, including topological-in-origin mass-barriers at the contacts between segments. The continuum model reproduces the NEGF results, including optical Dirac Fabry-Pérot (FP) equidistant oscillations for massless relativistic carriers in metallic armchair SGNRs, and an unequally-spaced FP pattern for mixed armchair-zigzag SGNRs where carriers transit from a relativistic (armchair) to a nonrelativistic (zigzag) regime. This provides a unifying framework for analysis of coherent transport phenomena and interpretation of forthcoming experiments in SGNRs.},
doi = {10.1038/srep07893},
url = {https://www.osti.gov/biblio/1204438}, journal = {Scientific Reports},
issn = {2045-2322},
number = ,
volume = 5,
place = {United States},
year = {2015},
month = {1}
}

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    Design of Atomically Precise Nanoscale Negative Differential Resistance Devices
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    Quantized Electron Transport Through Graphene Nanoconstrictions
    journal, April 2018