Quantum anomalous Hall effect in atomic crystal layers from in-plane magnetization

Ren, Yafei; Zeng, Junjie; Deng, Xinzhou; Yang, Fei; Pan, Hui; Qiao, Zhenhua

doi:10.1103/physrevb.94.085411

Cited by 51 publications

(46 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon increasing the on-site Coulomb repulsion, monolayer OsCl 3 undergoes quantum phase transition from QAH insulator to correlated metal, and finally to topologically trivial SO-coupled Mott insulator. Interestingly, large gap E g = 67 meV with nonzero Chern number C = −1 is observed even though its spontaneous magnetization is along the inplane easy-axis, which is possible when the mirror reflection symmetry is broken [41]. We note that Ref.…”

Section: Fig 2 (Color Online) Electronic Band Structure Of Monolayermentioning

confidence: 76%

“…Since in-plane magnetization or magnetic field cannot by itself induce quantized Hall conductance, some studies of potential QAH insulators have proposed [12] to apply external electric field to change MCA energy so that easy-axis tilts out of the plane. However, even inplane magnetization can generate QAH effect in crystals with preserved inversion symmetry but broken out-ofplane mirror reflection symmetry (i.e., z → −z) [41], as satisfied by the lattice shown in Fig. 1.…”

Section: Fig 2 (Color Online) Electronic Band Structure Of Monolayermentioning

confidence: 94%

See 1 more Smart Citation

Monolayer of the 5d transition metal trichloride OsCl3 : A playground for two-dimensional magnetism, room-temperature quantum anomalous Hall effect, and topological phase transitions

2017

View full text Add to dashboard Cite

Based on density functional theory (DFT) calculations, we predict that monolayer of OsCl3 (which is a layered material whose interlayer coupling is weaker than in graphite) possesses a quantum anomalous Hall (QAH) insulating phase generated by the combination of honeycomb lattice of osmium atoms, their strong spin-orbit coupling (SOC) and ferromagnetic ground state with inplane easy-axis. The band gap opened by SOC is Eg ≃ 67 meV (or ≃ 191 meV if the easy-axis can be tilted out of the plane by an external electric field), and the estimated Curie temperature of such anisotropic planar rotator ferromagnet is TC 350 K. The Chern number C = −1, generated by the manifold of Os t2g bands crossing the Fermi energy, signifies the presence of a single chiral edge state in nanoribbons of finite width, where we further show that edge states are spatially narrower for zigzag than armchair edges and investigate edge-state transport in the presence of vacancies at Os sites. Since 5d electrons of Os exhibit both strong SOC and moderate correlation effects, we employ DFT+U calculations to show how increasing on-site Coulomb repulsion U : gradually reduces Eg while maintaining C = −1 for 0 < U < Uc; leads to metallic phase with Eg = 0 at Uc; and opens a gap of topologically trivial Mott insulating phase with C = 0 for U > Uc.

show abstract

Section: Fig 2 (Color Online) Electronic Band Structure Of Monolayermentioning

confidence: 76%

Section: Fig 2 (Color Online) Electronic Band Structure Of Monolayermentioning

confidence: 94%

Monolayer of the 5d transition metal trichloride OsCl3 : A playground for two-dimensional magnetism, room-temperature quantum anomalous Hall effect, and topological phase transitions

2017

View full text Add to dashboard Cite

show abstract

“…We direct the exchange to point in plane along x; for uniform exchange this geometry was considered in Ref. 58. It is clear from the presented results in Fig.…”

mentioning

confidence: 99%

Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling

et al. 2020

View full text Add to dashboard Cite

We investigate an effective model of proximity modified graphene (or symmetrylike materials) with broken time-reversal symmetry. We predict the appearance of quantum anomalous Hall phases by computing bulk band gap and Chern numbers for benchmark combinations of system parameters. Allowing for staggered exchange field enables quantum anomalous Hall effect in flat graphene with Chern number C = 1. We explicitly show edge states in zigzag and armchair nanoribbons and explore their localization behavior. Remarkably, the combination of staggered intrinsic spin-orbit and uniform exchange coupling gives topologically protected (unlike in time-reversal systems) pseudohelical states, whose spin is opposite in opposite zigzag edges. Rotating the magnetization from out of plane to in plane makes the system trivial, allowing to control topological phase transitions. We also propose, using density functional theory, a material platform-graphene on Ising antiferromagnet MnPSe3-to realize staggered exchange (pseudospin Zeeman) coupling.

show abstract

“…Unlike 2D transition metal dichalcogenides (TMDs), which are naturally layered in their bulk phase, most transition metal monochalcogenides (TMMs) are not layered, making 2D TMMs difficult to obtain. Due to the special properties of monolayer honeycomb lattice, 2D TMMs with such a lattice attract much interest. Recently, we successfully fabricated honeycomb monolayer CuSe on Cu(111) surfaces .…”

mentioning

confidence: 99%

Epitaxial Growth of Honeycomb Monolayer CuSe with Dirac Nodal Line Fermions

et al. 2018

View full text Add to dashboard Cite

2D transition metal chalcogenides have attracted tremendous attention due to their novel properties and potential applications. Although 2D transition metal dichalcogenides are easily fabricated due to their layer-stacked bulk phase, 2D transition metal monochalcogenides are difficult to obtain. Recently, a single atomic layer transition metal monochalcogenide (CuSe) with an intrinsic pattern of nanoscale triangular holes is fabricated on Cu(111). The first-principles calculations show that free-standing monolayer CuSe with holes is not stable, while hole-free CuSe is endowed with the Dirac nodal line fermion (DNLF), protected by mirror reflection symmetry. This very rare DNLF state is evidenced by topologically nontrivial edge states situated inside the spin-orbit coupling gaps. Motivated by the promising properties of hole-free honeycomb CuSe, monolayer CuSe is fabricated on Cu(111) surfaces by molecular beam epitaxy and confirmed success with high resolution scanning tunneling microscopy. The good agreement of angle resolved photoemission spectra with the calculated band structures of CuSe/Cu(111) demonstrates that the sample is monolayer CuSe with a honeycomb lattice. These results suggest that the honeycomb monolayer transition metal monochalcogenide can be a new platform to study 2D DNLFs.

show abstract

Quantum anomalous Hall effect in atomic crystal layers from in-plane magnetization

Cited by 51 publications

References 34 publications

Monolayer of the 5d transition metal trichloride OsCl3 : A playground for two-dimensional magnetism, room-temperature quantum anomalous Hall effect, and topological phase transitions

Monolayer of the 5d transition metal trichloride OsCl3 : A playground for two-dimensional magnetism, room-temperature quantum anomalous Hall effect, and topological phase transitions

Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling

Epitaxial Growth of Honeycomb Monolayer CuSe with Dirac Nodal Line Fermions

Contact Info

Product

Resources

About