Topological Phases in Cove-Edged and Chevron Graphene Nanoribbons: Geometric Structures, Z 2 Invariants, and Junction States
Abstract
Graphene nanoribbons (GNRs) have recently been shown by Cao, Zhao, and Louie [Cao, T.; Zhao, F.; Louie, S. G. Phys. Rev. Lett.2017, 119, 076401] to possess distinct topological phases in general, characterized by a 2 invariant. Cove-edged and chevron GNRs moreover are chemically and structurally diverse, quasi-one-dimensional (1D) nanostructures whose structure and electronic properties can be rationally controlled by bottom-up synthesis from precursor molecules. We derive the value of the topological invariant of the different types of cove-edged and chevron GNRs, and we investigate the electronic properties of various junctions formed by these GNRs, as well as such GNRs with the more common armchair or zigzag GNRs. We study the topological junction states at the interface of two topologically distinct segments. For an isolated GNR having two ends of different terminations, topological end states are shown to develop only at the topologically nontrivial end. Our work extends the explicit categorization of topological invariants of GNRs beyond the previously demonstrated armchair GNRs and provides new design rules for novel GNR junctions as well as future GNR-based nanoelectronic devices.
- Authors:
-
- Pohang Univ. of Science and Technology, Pohang, Kyungbuk (Korea). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Pohang Univ. of Science and Technology, Pohang, Kyungbuk (Korea). Dept. of Physics
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1543687
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 11; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry; Science & Technology - Other Topics; Materials Science; Physics
Citation Formats
Lee, Yea-Lee, Zhao, Fangzhou, Cao, Ting, Ihm, Jisoon, and Louie, Steven G. Topological Phases in Cove-Edged and Chevron Graphene Nanoribbons: Geometric Structures, Z 2 Invariants, and Junction States. United States: N. p., 2018.
Web. doi:10.1021/acs.nanolett.8b03416.
Lee, Yea-Lee, Zhao, Fangzhou, Cao, Ting, Ihm, Jisoon, & Louie, Steven G. Topological Phases in Cove-Edged and Chevron Graphene Nanoribbons: Geometric Structures, Z 2 Invariants, and Junction States. United States. doi:10.1021/acs.nanolett.8b03416.
Lee, Yea-Lee, Zhao, Fangzhou, Cao, Ting, Ihm, Jisoon, and Louie, Steven G. Tue .
"Topological Phases in Cove-Edged and Chevron Graphene Nanoribbons: Geometric Structures, Z 2 Invariants, and Junction States". United States. doi:10.1021/acs.nanolett.8b03416. https://www.osti.gov/servlets/purl/1543687.
@article{osti_1543687,
title = {Topological Phases in Cove-Edged and Chevron Graphene Nanoribbons: Geometric Structures, Z 2 Invariants, and Junction States},
author = {Lee, Yea-Lee and Zhao, Fangzhou and Cao, Ting and Ihm, Jisoon and Louie, Steven G.},
abstractNote = {Graphene nanoribbons (GNRs) have recently been shown by Cao, Zhao, and Louie [Cao, T.; Zhao, F.; Louie, S. G. Phys. Rev. Lett.2017, 119, 076401] to possess distinct topological phases in general, characterized by a 2 invariant. Cove-edged and chevron GNRs moreover are chemically and structurally diverse, quasi-one-dimensional (1D) nanostructures whose structure and electronic properties can be rationally controlled by bottom-up synthesis from precursor molecules. We derive the value of the topological invariant of the different types of cove-edged and chevron GNRs, and we investigate the electronic properties of various junctions formed by these GNRs, as well as such GNRs with the more common armchair or zigzag GNRs. We study the topological junction states at the interface of two topologically distinct segments. For an isolated GNR having two ends of different terminations, topological end states are shown to develop only at the topologically nontrivial end. Our work extends the explicit categorization of topological invariants of GNRs beyond the previously demonstrated armchair GNRs and provides new design rules for novel GNR junctions as well as future GNR-based nanoelectronic devices.},
doi = {10.1021/acs.nanolett.8b03416},
journal = {Nano Letters},
number = 11,
volume = 18,
place = {United States},
year = {2018},
month = {9}
}
Web of Science
Figures / Tables:

Works referencing / citing this record:
On‐Surface Synthesis and Spectroscopic Characterization of Laterally Extended Chevron Graphene Nanoribbons
journal, June 2019
- Teeter, Jacob D.; Zahl, Percy; Mehdi Pour, Mohammad
- ChemPhysChem, Vol. 20, Issue 18
Liquid-phase bottom-up synthesis of graphene nanoribbons
journal, January 2020
- Yoon, Ki-Young; Dong, Guangbin
- Materials Chemistry Frontiers, Vol. 4, Issue 1
Engineered electronic states in atomically precise artificial lattices and graphene nanoribbons
journal, January 2019
- Yan, Linghao; Liljeroth, Peter
- Advances in Physics: X, Vol. 4, Issue 1
Crystallographic Characterization of Black Phosphorene and its Application in Nanostructures
journal, December 2019
- Ren, Yi; Liu, Pu; Zhou, Benliang
- Physical Review Applied, Vol. 12, Issue 6
Figures / Tables found in this record: