Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.257201
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Funding
- [DMR-1408838]
- [DMR-1506119]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1408838] Funding Source: National Science Foundation
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We study adatom-covered single layers of CrSiTe3 and CrGeTe3 using first-principles calculations based on hybrid functionals. We find that the insulating ground state of a monolayer of La (Lu) deposited on single-layer CrSiTe3 (CrGeTe3) carries spontaneously generated current loops around the Cr sites. These flux states induce antiferromagnetically ordered orbital moments on the Cr sites and are also associated with nontrivial topological properties. The calculated Chern numbers for these systems are predicted to be +/- 1 even in the absence of spin-orbit coupling, with sizable gaps on the order of 100 meV. The flux states and the associated topological phases result from spontaneous time-reversal symmetry breaking due to the presence of nonlocal Coulomb interactions.
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