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Title: A new exotic state in an old material: a tale of SmB{sub 6}

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.
Authors:
 [1] ;  [2]
  1. Kent State University, Department of Physics (United States)
  2. University of Maryland, Condensed Matter Theory Center and Department of Physics (United States)
Publication Date:
OSTI Identifier:
22210472
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 117; Journal Issue: 3; Other Information: Copyright (c) 2013 Pleiades Publishing, Inc.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHIRALITY; CRYSTALS; DEGREES OF FREEDOM; ELECTRONS; PARITY; PERTURBATION THEORY; SAMARIUM BORIDES; STRONG INTERACTIONS; SURFACES; SYMMETRY; TEMPERATURE RANGE 0065-0273 K