Quantum anomalous Hall effect and giant Rashba spin-orbit splitting in graphene system co-doped with boron and 5<i>d</i> transition-metal atoms

doi:10.1007/s11467-018-0806-y

Front. Phys.

2018, Vol. 13

Issue (5) : 137308 https://doi.org/10.1007/s11467-018-0806-y

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Quantum anomalous Hall effect and giant Rashba spin-orbit splitting in graphene system co-doped with boron and 5d transition-metal atoms

Xinzhou Deng^1,², Hualing Yang³, Shifei Qi^1,³(

), Xiaohong Xu³, Zhenhua Qiao^1,²(

)

¹. ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
². CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei 230026, China
³. School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, China

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Abstract

Quantum anomalous Hall effect (QAHE) is a fundamental quantum transport phenomenon in condensed matter physics. Until now, the QAHE has only been experimentally realized for Cr/V-doped (Bi, Sb)₂Te₃ but at an extremely low observational temperature, thereby limiting its potential application in dissipationless quantum electronics. By employing first-principles calculations, we study the electronic structures of graphene co-doped with 5d transition metal and boron atoms based on a compensated n–p co-doping scheme. Our findings are as follows: i) The electrostatic attraction between the n- and p-type dopants effectively enhances the adsorption of metal adatoms and suppresses their undesirable clustering. ii) Hf-B and Os-B co-doped graphene systems can establish long-range ferromagnetic order and open larger nontrivial band gaps because of the stronger spin-orbit coupling with the non-vanishing Berry curvatures to host the high-temperature QAHE. iii) The calculated Rashba splitting energies in Re–B and Pt–B co-doped graphene systems can reach up to 158 and 85 meV, respectively, which are several orders of magnitude higher than the reported intrinsic spin-orbit coupling strength.

Keywords graphene quantum anomalous Hall effect spin-orbit coupling

Corresponding Author(s): Shifei Qi,Zhenhua Qiao

Issue Date: 29 June 2018

Cite this article:

Xinzhou Deng,Hualing Yang,Shifei Qi, et al. Quantum anomalous Hall effect and giant Rashba spin-orbit splitting in graphene system co-doped with boron and 5d transition-metal atoms[J]. Front. Phys. , 2018, 13(5): 137308.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-018-0806-y
https://academic.hep.com.cn/fop/EN/Y2018/V13/I5/137308

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