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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dong, Liang Kim, Youngkuk Er, Dequan Rappe, Andrew M. Shenoy, Vivek B. |
| Description | Country affiliation: United States Author Affiliation: Dong L ( Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.); Kim Y ( The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.); Er D ( Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.); Rappe AM ( The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.); Shenoy VB ( Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.) |
| Abstract | The quantum anomalous Hall (QAH) insulator is a novel topological state of matter characterized by a nonzero quantized Hall conductivity without an external magnetic field. Using first-principles calculations, we predict the QAH state in monolayers of covalent-organic frameworks based on the newly synthesized $ X _{ 3 } ( C _{ 18 } H _{ 12 } N _{ 6 } ) _{ 2 } $ structure where $ X $ represents $ 5 d $ transition metal elements Ta, Re, and Ir. The $ π $ conjugation between $ X $ $ d _{ x z } $ and $ d _{ y z } $ orbitals, mediated by N $ p _{ z } $ and C $ p _{ z } $ orbitals, gives rise to a massive Dirac spectrum in momentum space with a band gap of up to 24 meV due to strong spin-orbit coupling. We show that the QAH state can appear by chemically engineering the exchange field and the Fermi level in the monolayer structure, resulting in nonzero Chern numbers. Our results suggest a reliable pathway toward the realization of a QAH phase at temperatures between 100 K and room temperature in covalent-organic frameworks. |
| File Format | HTM / HTML |
| ISSN | 00319007 |
| e-ISSN | 10797114 |
| Journal | Physical Review Letters |
| Issue Number | 9 |
| Volume Number | 116 |
| Language | English |
| Publisher | American Physical Society |
| Publisher Date | 2016-03-04 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy |
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