Quantum anomalous Hall insulator phase in asymmetrically functionalized germanene
Abstract
Here, using first-principles computations, we discuss topological properties of germanene in buckled as well as planar honeycombs with asymmetric passivation via hydrogen and nitrogen (GeHN) atoms. GeHN in the planar structure is found to harbor a quantum anomalous Hall (QAH) insulator phase. Our analysis indicates that the buckled GeHN also possesses a QAH phase under tensile strain. We computed the associated Chern numbers and edge states to confirm the presence of the QAH state. In particular, chiral edge bands connecting conduction and valence bands were found at the edges of a planar zigzag GeHN nanoribbon. By considering a range of buckling distances, we demonstrate how the system undergoes the transition from the trivial to the QAH phase between the buckled and planar structures. Finally, we show CdTe(111) to be a suitable substrate for supporting buckled germanene in the QAH phase. Our results suggest that functionalized germanene could provide a robust QAH-based platform for spintronics applications.
- Authors:
-
- Southern University of Science and Technology, Shenzhen, Guangdong (China); National Sun Yat-Sen University, Kaohsiung (Taiwan)
- Xiamen University (China)
- National Sun Yat-Sen University, Kaohsiung (Taiwan)
- Xiamen University (China); Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen (China)
- National University of Singapore (Singapore)
- Northeastern Univ., Boston, MA (United States)
- Southern University of Science and Technology, Shenzhen, Guangdong (China)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Taiwan Ministry of Science and Technology (MOST); National Research Foundation Singapore (NRF)
- OSTI Identifier:
- 1470301
- Alternate Identifier(s):
- OSTI ID: 1399626
- Grant/Contract Number:
- SC0012575; 11404160; KQTD2016022619565991; MOST-104-2112-M-110-002-MY3; MOST-103-2112-M-110-008-MY3; 11574257; FG02-07ER46352; AC02-05CH11231; NRF-NRFF2013-03
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 16; Related Information: CCDM partners with Temple University (lead); Brookhaven National Laboratory; Drexel University; Duke University; North Carolina State University; Northeastern University; Princeton University; Rice University; University of Pennsylvania; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous); solar (photovoltaic); energy storage (including batteries and capacitors); hydrogen and fuel cells; defects; mechanical behavior; materials and chemistry by design; synthesis (novel materials)
Citation Formats
Hsu, Chia-Hsiu, Fang, Yimei, Wu, Shunqing, Huang, Zhi-Quan, Crisostomo, Christian P., Gu, Yu-Ming, Zhu, Zi-Zhong, Lin, Hsin, Bansil, Arun, Chuang, Feng-Chuan, and Huang, Li. Quantum anomalous Hall insulator phase in asymmetrically functionalized germanene. United States: N. p., 2017.
Web. doi:10.1103/physrevb.96.165426.
Hsu, Chia-Hsiu, Fang, Yimei, Wu, Shunqing, Huang, Zhi-Quan, Crisostomo, Christian P., Gu, Yu-Ming, Zhu, Zi-Zhong, Lin, Hsin, Bansil, Arun, Chuang, Feng-Chuan, & Huang, Li. Quantum anomalous Hall insulator phase in asymmetrically functionalized germanene. United States. https://doi.org/10.1103/physrevb.96.165426
Hsu, Chia-Hsiu, Fang, Yimei, Wu, Shunqing, Huang, Zhi-Quan, Crisostomo, Christian P., Gu, Yu-Ming, Zhu, Zi-Zhong, Lin, Hsin, Bansil, Arun, Chuang, Feng-Chuan, and Huang, Li. Mon .
"Quantum anomalous Hall insulator phase in asymmetrically functionalized germanene". United States. https://doi.org/10.1103/physrevb.96.165426. https://www.osti.gov/servlets/purl/1470301.
@article{osti_1470301,
title = {Quantum anomalous Hall insulator phase in asymmetrically functionalized germanene},
author = {Hsu, Chia-Hsiu and Fang, Yimei and Wu, Shunqing and Huang, Zhi-Quan and Crisostomo, Christian P. and Gu, Yu-Ming and Zhu, Zi-Zhong and Lin, Hsin and Bansil, Arun and Chuang, Feng-Chuan and Huang, Li},
abstractNote = {Here, using first-principles computations, we discuss topological properties of germanene in buckled as well as planar honeycombs with asymmetric passivation via hydrogen and nitrogen (GeHN) atoms. GeHN in the planar structure is found to harbor a quantum anomalous Hall (QAH) insulator phase. Our analysis indicates that the buckled GeHN also possesses a QAH phase under tensile strain. We computed the associated Chern numbers and edge states to confirm the presence of the QAH state. In particular, chiral edge bands connecting conduction and valence bands were found at the edges of a planar zigzag GeHN nanoribbon. By considering a range of buckling distances, we demonstrate how the system undergoes the transition from the trivial to the QAH phase between the buckled and planar structures. Finally, we show CdTe(111) to be a suitable substrate for supporting buckled germanene in the QAH phase. Our results suggest that functionalized germanene could provide a robust QAH-based platform for spintronics applications.},
doi = {10.1103/physrevb.96.165426},
journal = {Physical Review B},
number = 16,
volume = 96,
place = {United States},
year = {Mon Oct 16 00:00:00 EDT 2017},
month = {Mon Oct 16 00:00:00 EDT 2017}
}
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