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Title: Quantum anomalous Hall effect in ferromagnetic transition metal halides

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [2];  [3]
  1. Nanjing Univ. of Science and Technology (China). Key Lab. of Soft Chemistry and Functional Materials; Virginia Commonwealth Univ., Richmond, VA (United States)
  2. Virginia Commonwealth Univ., Richmond, VA (United States)
  3. Nanjing Univ. of Science and Technology (China). Key Lab. of Soft Chemistry and Functional Materials

The quantum anomalous Hall (QAH) effect is a novel topological spintronic phenomenon arising from inherent magnetization and spin-orbit coupling. Various theoretical and experimental efforts have been devoted in search of intrinsic QAH insulators. However, up to now, it has only been observed in Cr or V doped (Bi,Sb)2Te3 film in experiments with very low working temperature. Based on the successful synthesis of transition metal halides, we use first-principles calculations to predict that the RuI3 monolayer is an intrinsic ferromagnetic QAH insulator with a topologically nontrivial global band gap of 11 meV. This topologically nontrivial band gap at the Fermi level is due to its crystal symmetry, thus the QAH effect is robust. Its Curie temperature, estimated to be ~360K using Monte Carlo simulation, is above room temperature and higher than most two-dimensional ferromagnetic thin films. The inclusion of Hubbard U in the Ru-d electrons does not affect this result. Furthemore, we also discuss the manipulation of its exchange energy and nontrivial band gap by applying in-plane strain. Our work adds an experimentally feasible member to the QAH insulator family, which is expected to have broad applications in nanoelectronics and spintronics.

Research Organization:
Virginia Commonwealth Univ., Richmond, VA (United States); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; USDOE
Grant/Contract Number:
FG02-96ER45579; AC02-05CH11231; 11374160; 51522206; 11574151; 30915011203
OSTI ID:
1535838
Alternate ID(s):
OSTI ID: 1338860
Journal Information:
Physical Review B, Vol. 95, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 83 works
Citation information provided by
Web of Science

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Cited By (13)

Electronic structures and band alignments of monolayer metal trihalide semiconductors MX 3 journal January 2017
A 2D ferromagnetic semiconductor in monolayer Cr-trihalide and its Janus structures journal January 2018
Protecting quantum anomalous Hall state from thermal fluctuation via the giant magnetic anisotropy of Os-based dimers journal January 2018
Robust half-metallicity in transition metal tribromide nanowires journal January 2018
Long range intrinsic ferromagnetism in two dimensional materials and dissipationless future technologies journal December 2018
Strain effects on electronic and magnetic properties of the monolayer α - RuCl 3: A first-principles and Monte Carlo study journal February 2019
Prediction of quantum anomalous Hall effect and giant magnetic anisotropy in graphene with adsorbed Ir-based dimers journal May 2019
Physical realization of 2D spin liquid state by ab initio design and strain engineering in FeX 3 journal July 2018
High throughput computational screening for 2D ferromagnetic materials: the critical role of anisotropy and local correlations journal July 2019
Two-Dimensional Room-Temperature Ferromagnetic Semiconductors with Quantum Anomalous Hall Effect journal August 2019
Electronic and magnetic properties of the monolayer RuCl$_3$: A first-principles and Monte Carlo study text January 2017
Long Range Intrinsic Ferromagnetism in Two Dimensional Materials and Dissipationless Future Technologies text January 2018
Two-Dimensional Room Temperature Ferromagnetic Semiconductors with Quantum Anomalous Hall Effect text January 2019