期刊
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
卷 117, 期 3, 页码 499-507出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063776113110083
关键词
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资金
- Ohio Board of Regents Research Incentive Program [OBR-RIP-220573]
- Kent State University
- U.S. National Science Foundation I2CAM International Materials Institute Award [DMR-0844115]
- DOE-BES [DESC000191]
- Direct For Mathematical & Physical Scien [0844115] Funding Source: National Science Foundation
- Division Of Materials Research [0844115] Funding Source: National Science Foundation
We review current theoretical and experimental efforts to identify a novel class of intermetallic 4f and 5f orbital materials in which strong interactions between itinerant and predominately localized degrees of freedom give rise to a bulk insulating state at low temperatures, while the surface remains metallic. This effect arises due to inversion of even-parity conduction bands and odd-parity very narrow f-electron bands. The number of band inversions is mainly determined by the crystal symmetry of a material and the corresponding degeneracy of the hybridized f-electron bands. For an odd number of band inversions, the metallic surface states are chiral and therefore remain robust against disorder and time-reversal invariant perturbations. We discuss a number of unresolved theoretical issues specific to topological Kondo insulators and outline experimental challenges in probing the chiral surface states in these materials.
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