Ferrimagnetic Slater Insulator Phase of the Sn/Ge(111) Surface
- Title
- Ferrimagnetic Slater Insulator Phase of the Sn/Ge(111) Surface
- Other Titles
- Ge(111) Surface
- Author
- 조준형
- Keywords
- Exchange-correlation functionals; Ferrimagnetic order; Ferrimagnetic structure; Hybrid density-functional theoryInsu; lating phase; Self-interaction error; Structural symmetry; Van Der Waals interactions
- Issue Date
- 2013-09
- Publisher
- AMERICAN PHYSICAL SOCIETY
- Citation
- Physical Review Letters, 2013, 111(10), P.106403
- Abstract
- We have performed the semilocal and hybrid density-functional theory (DFT) studies of the Sn/Ge(111) surface to identify the origin of the observed insulating 3?√×3?√ phase below ∼30 K. Contrasting with the semilocal DFT calculation predicting a metallic 3×3 ground state, the hybrid DFT calculation including van der Waals interactions shows that the insulating ferrimagnetic structure with 3?√×3?√ structural symmetry is energetically favored over the metallic 3×3 structure. It is revealed that the correction of self-interaction error with a hybrid exchange-correlation functional gives rise to a band-gap opening induced by a ferrimagnetic order. The results manifest that the observed insulating phase is attributed to the Slater mechanism via itinerant magnetic order rather than the hitherto accepted Mott-Hubbard mechanism via electron correlations.
- URI
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.106403
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.111.106403
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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