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Competing magnetic orderings and tunable topological states in two-dimensional hexagonal organometallic lattices

Title
Competing magnetic orderings and tunable topological states in two-dimensional hexagonal organometallic lattices
Author
조준형
Keywords
TRANSITION-METAL DICHALCOGENIDES; HGTE QUANTUM-WELLS; SINGLE DIRAC CONE; SPIN; INSULATORS; GRAPHENE; SPINTRONICS; SEMICONDUCTORS; ELECTRONICS; SURFACE
Issue Date
2016-01
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v. 93, NO 4, Page. 41404-41404
Abstract
The exploration of topological states is of significant fundamental and practical importance in contemporary condensed matter physics, for which the extension to two-dimensional (2D) organometallic systems is particularly attractive. Using first-principles calculations, we show that a 2D hexagonal triphenyl-lead lattice composed of only main group elements is susceptible to a magnetic instability, characterized by a considerably more stable antiferromagnetic (AFM) insulating state rather than the topologically nontrivial quantum spin Hall state proposed recently. Even though thisAFMphase is topologically trivial, it possesses an intricate emergent degree of freedom, defined by the product of spin and valley indices, leading to Berry curvature-induced spin and valley currents under electron or hole doping. Furthermore, such a trivial band insulator can be tuned into a topologically nontrivial matter by the application of an out-of-plane electric field, which destroys the AFM order, favoring instead ferrimagnetic spin ordering and a quantum anomalous Hall state with a nonzero topological invariant. These findings further enrich our understanding of 2D hexagonal organometallic lattices for potential applications in spintronics and valleytronics.
URI
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.041404http://hdl.handle.net/20.500.11754/30617
ISSN
1098-0121; 1550-235X
DOI
10.1103/PhysRevB.93.041404
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COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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