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:
-
- 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:
- 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},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Tue Jan 20 00:00:00 EST 2015},
month = {Tue Jan 20 00:00:00 EST 2015}
}
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