Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.016402
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Funding
- NSF of China
- NSF of Zhejiang Province
- 973 Project of the MOST
- U.S. Army Research Office [W911NF-13-1-0202]
- Robert A. Welch Foundation [C-1411]
- NSC [98-2918-I-009-06, 98-2112-M-009-010-MY3]
- NCTU-CTS
- NCTS
- MOE-ATU program of Taiwan
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We investigate the competition between the spin-orbit interaction of itinerant electrons and their Kondo coupling with local moments densely distributed on the honeycomb lattice. We find that the model at half-filling displays a quantum phase transition between topological and Kondo insulators at a nonzero Kondo coupling. In the Kondo-screened case, tuning the electron concentration can lead to a new topological insulator phase. The results suggest that the heavy-fermion phase diagram contains a new regime with a competition among topological, Kondo-coherent and magnetic states, and that the regime may be especially relevant to Kondo lattice systems with 5d-conduction electrons. Finally, we discuss the implications of our results in the context of the recent experiments on SmB6 implicating the surface states of a topological insulator, as well as the existing experiments on the phase transitions in SmB6 under pressure and in CeNiSn under chemical pressure.
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