Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session M39: Invited Session: SmB6: A Possible Topological Kondo Insulator
11:15 AM–2:15 PM,
Wednesday, March 5, 2014
Room: Mile High Ballroom 2A-3A
Sponsoring Unit: DCMP
Chair: Zach Fisk, University of California, Irvine
Abstract ID: BAPS.2014.MAR.M39.2
Abstract: M39.00002 : Topological surface state in the Kondo insulator Samarium Hexaboride*
11:51 AM–12:27 PM
Preview Abstract Abstract
(University of California, Irvine)
Topological invariants of electron wave functions in condensed matter reveal many intriguing phenomena. The most exotic one is the topological insulator (TI) characterized by the Z2 group where an insulating bulk coexists with a metallic boundary state. Possible novel quantum states supporting coherent qubits using Majorana fermions with their potential for technological application have led to intense research into Bi based TIs with large band gap. However, the main complication concerning these Bi based materials is their considerable residual conductivity in the bulk, and only experimental techniques distinguishing bulk and surface clearly such as ARPES or STM can be used to explore the surface properties of these materials properly. Theories predict that a Kondo insulator SmB6, which evolves from a Kondo lattice metal to an insulator with a small gap as the temperature is lowered, could be a topological insulator. Although the insulating bulk and metallic surface separation has been demonstrated in recent transport measurements, these were not able to prove that the metallic surface state is topologically protected. we report careful thickness dependence transport measurements on doped SmB6 which show that magnetic and non-magnetic dopants in SmB6 exhibit clearly contrasting behavior supporting that that SmB6 is the first perfect 3D topological insulator with virtually zero residual bulk conductivity. We anticipate our results to be a starting point to explore the details of topological Kondo insulators and their potential applications toward scalable quantum information processing.
*This research was supported by NSF-DMR-0801253 and UC Irvine CORCL Grant MIIG-2011-12-8.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.M39.2
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