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Title: Intrinsic Quantum Anomalous Hall Effect with In-Plane Magnetization: Searching Rule and Material Prediction

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Univ. of Science and Technology of China, Anhui (China)
  2. Univ. of Utah, Salt Lake City, UT (United States); Collaborative Innovation Center of Quantum Matter, Beijing (Matter)

So far, most theoretically predicted and experimentally confirmed quantum anomalous Hall effects (QAHEs) are limited in two-dimensional (2D) materials with out-of-plane magnetization. In this Letter, starting from 2D nodal-line semimetal, a general rule for searching QAHE with in-plane magnetization is mapped out. Because of spin-orbital coupling, we found that the magnetization will prefer an in-plane orientation if the orbital of degenerate nodal-line states at the Fermi level have the same absolute value of magnetic quantum number. Moreover, depending on the broken or conserved mirror symmetry, either a QAHE or 2D semimetal can be realized. Based on first principles calculations, we further predict a real material of monolayer LaCl to be an intrinsic QAHE with in-plane magnetization. By tuning the directions of in-plane magnetization, the QAHE in LaCl demonstrates a threefold rotational symmetry with a Chern number of either +1 or –1 , and the transition point is characterized by a 2D semimetal phase. All these features are quantitatively reproduced by tight-binding model calculations, revealing the underlying physics clearly. Here, our results greatly extend the scope for material classes of QAHE and hence stimulate immediate experimental interest.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-04ER46148; AHY090400; 2017YFA0204904; 2016YFA0200604
OSTI ID:
1609552
Alternate ID(s):
OSTI ID: 1485743
Journal Information:
Physical Review Letters, Vol. 121, Issue 24; ISSN 0031-9007
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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Theoretical model of spintronic device based on tunable anomalous Hall conductivity of monolayer CrI 3 journal January 2020
Two-Dimensional Room Temperature Ferromagnetic Semiconductors with Quantum Anomalous Hall Effect text January 2019