CONFERENCE PROCEEDINGS
Advanced Search >
Home > Proceedings > Volume 11090 > Article
Translator Disclaimer
Open Access Presentation
10 September 2019 Superstructured graphene towards topological orbitronics (Conference Presentation)
Xiao Hu
Author Affiliations +
Proceedings Volume 11090, Spintronics XII; 110902M (2019) https://doi.org/10.1117/12.2528587
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
Abstract
Graphene provides an ideal table-top test-ground for relativistic physics due to the Dirac-type linear dispersion of  electrons of carbon atoms. Haldane and Kane and Mele discovered that, taking into account the hopping between next-nearest-neighbor carbon atoms, one can achieve topological electronic states known as quantum anomalous Hall effect and quantum spin Hall effect [1].　Recently we have found that introducing superstructures respecting C6v crystalline symmetry into graphene will also generate topological states [2-6], without resort to staggered flux and/or spin-orbit coupling. As an example of our approach, we reveal that triangular and honeycomb nano-hole arrays punctured in graphene yield topologically distinct states, and that in the patchwork of them topological interface states appear which are protected by an energy gap up to 0.5 eV [7]. The unidirectional propagating interface states are dominated by a pseudospin, an emergent degree of freedom intimately related to the orbital angular momentum of the Bloch wavefunctions, which can be exploited for orbitronics functionality. Using nano holes with unbalanced numbers of carbon atoms in the two sublattices of honeycomb lattice, one may obtain spinful topological states, which hopefully can be developed for spintronics applications. References: [1] H.-M. Weng, R. Yu, X. Hu, X. Dai and Z. Fang, Adv. Phys. 64, 227 (2015). [2] L.-H. Wu and X. Hu, Phys. Rev. Lett. 114, 223901 (2015). [3] Y.-T. Yang, X. Hu, Z.-H. Hang et al., Phys. Rev. Lett. 120, 217401 (2018). [4] Y. Li, H. Chen, X. Hu et al., Nat. Commun. 9, 4598 (2018). [5] L.-H. Wu and X. Hu, Sci. Rep. 6, 24347 (2016). [6] T. Kariyado and X. Hu, Sci. Rep. 7, 16515 (2017). [7] T. Kariyado, Y.-C. Jiang, H.-X. Yang and X. Hu, Phys. Rev. B 98, 195416 (2018).
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Xiao Hu "Superstructured graphene towards topological orbitronics (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 110902M (10 September 2019); https://doi.org/10.1117/12.2528587
PROCEEDINGS
 PRESENTATION
WATCH
PRESENTATION SAVE TO MY LIBRARY
SHARE
GET CITATION
< Previous Article
|
Next Article >
Advertisement
Advertisement
KEYWORDS
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top